OpenTTD v14.0-beta1 is released. OpenTTD is an open source simulation game based upon the popular Microprose game "Transport Tycoon Deluxe", written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.

Features
OpenTTD is modelled after the original Transport Tycoon game by Chris Sawyer and enhances the game experience dramatically. Many features were inspired by TTDPatch while others are original.

Significant enhancements from the original game include:
bigger maps (up to 64 times in size)
stable multiplayer mode for up to 255 players in 15 companies, or as spectators
dedicated server mode and an in-game console for administration
IPv6 and IPv4 support for all communication of the client and server
in game downloading of AIs, NewGRFs, scenarios and heightmaps
new pathfinding algorithms that makes vehicles go where you want them to
autorail/-road build tool, improved terraforming
canals, shiplifts, aqueducts
larger, non-uniform stations and the ability to join them together
mammoth and multi-headed trains
different configurable models for acceleration of vehicles
clone, autoreplace and autoupdate vehicles
the possibility to build on slopes and coasts
advanced/conditional orders, share and copy orders
longer and higher bridges including several new designs, plus fully flexible tracks/roads under bridges
reworked airport system with many more airports/heliports (e.g. international and metropolitan)
presignals, semaphores, path based signalling
support for TTDPatch NewGRF features offering many options for graphics and behaviour configuration/modification
drive-through road stops for articulated road vehicles and trams
multiple trees on one tile
bribe the town authority
many configuration settings to tune the game to your liking
save games using zlib compression for smaller sizes, while not interrupting gameplay
significant internationalisation support. OpenTTD has already been translated into over 50 languages
dynamically created town names in 18 languages, plus NewGRF support for additional languages
freely distributable graphics, sounds and music
framework for custom (user) written AIs
zooming further out in the normal view and zooming out in the small map
Lots of effort has been put into making OpenTTD easy to use. These include:

convert rail tool (to electrified rail, monorail, and maglev)
drag&drop support for almost all tools (demolition, road/rail building/removing, stations, scenario editor, etc)
sorting of most lists based on various criteria (vehicle, station, town, industries, etc.)
mouse wheel support (scroll menus, zoom in/out)
autoscroll when the mouse is near the edge of the screen/window
sell whole train by dragging it to the dynamite trashcan
cost estimation with the 'shift' key
advanced options configuration window, change settings from within the game
Graphical/interface features:

screenshots can be in BMP, PNG or PCX format (select in game options menu)
more currencies (including Euro introduction in 2002)
extra viewports to view more parts of the game world at the same time
resolution and refresh rate selection for fullscreen mode
colourful newspaper after a certain date
colour coded vehicle profits
game speed increase (through fast forward button or by pressing the TAB key)
snappy and sticky windows that always stay on top and neatly align themselves to other windows
more hotkeys for even less mouse-clicking
support for 32 bit graphics
support for right-to-left languages
support for other (sized) fonts where the user interface scales based on the font and translation

OpenTTD Changelog:
Feature: Order option to unbunch vehicles at depot (#11945)
Feature: Infinite money mode (#11902)
Feature: Setting to disable the loading speed penalty for trains longer than the station (#11682)
Feature: Plugin framework for Social Integration with Steam, Discord, GOG, etc (#11628)
Feature: Scalable OpenTTD TrueType font made by Zephyris (#11593)
Feature: Toyland-specific river graphics (#11523)
Feature: Add zoom level buttons to sprite aligner (#11518)
Feature: Add shading to river slopes (#11491)
Feature: Place cargo icon on cargo filter dropdowns (#11487)
Feature: Mode to display timetable in seconds (#11435)
Feature: Setting to influence how many minutes a calendar year takes (#11428)
Feature: Base graphics can offer parameters for additional settings (#11347)
Feature: Sandbox option to lock station ratings at 100% (#11346)
Feature: Setting to use real-time "wallclock" as timekeeping units (#11341)
Feature: Setting to automatically restart server based on hours played (#11142)
Feature: Add config option to set default company secondary colour for new games (#11068)
Feature: Transparency option for cost and income indicators (#11001)
Feature: Create group of vehicles from manage vehicle list button (#10890)
Feature: Show coverage highlight the same as stations when adding waypoints (#10875)
Feature: Show the number of industries already built in the Fund New Industry window (#10806)
Feature: Add search filter and name text to build waypoint window (#10786)
Feature: Setting to disallow level crossings with competitors (#10755)
Feature: Opt-in survey when leaving a game (#10719)
Feature: Replace buying/selling company shares with hostile takeovers of AI companies (#10709, #10914)
Feature: Settings to scale cargo production of towns and industries (#10606)
Feature: Separate rail/road and sea/air velocity units, and add knots (#10594)
Feature: Region-based pathfinder for ships (#10543)
Feature: Filter engine build menu by name and NewGRF extra text (#10519)
Feature: Industry directory text filter (#10518)
Feature: Ctrl+Click to reset late counter for the entire vehicle group (#10464)
Feature: Orientation of rail and road depots can be changed (#9642)
Feature: Display help and manuals in-game (#7786)
Feature: [NewGRF] Town production effect and multiplier (#11947)
Feature: [NewGRF] Randomize direction of rail vehicle on build based on probability callback (#11489)
Feature: [NewGRF] Related Act2 objects for airports and airport tiles (#11282)
Feature: [NewGRF] Allow higher max speeds for ships (#10734)
Feature: [NewGRF] Increase limit of objects/stations/roadstops per NewGRF (#10672)
Feature: [NewGRF] Road stops (#10144)
Feature: [Script] Goal destination can be updated (#10817)
Add: Argument for console command "restart" to use either current or newgame settings (#11962, #11963)
Add: {CURRENCY_SHORT} only did k / m suffix. Add bn / tn and make translatable (#11921)
Add: Show in multiplayer the amount of hours a game has been unpaused (#11886)
Add: Allow loading heightmaps from command-line (#11870)
Add: List_[scenario|heightmap] and load_[scenario|height] console commands (#11867)
Add: Latvian Lats currency (#11691)
Add: Horizontal scroll for script debug log (#11597)
Add: GUI options to select sprite font and AA mode for all fonts (#11593)
Add: Website button for basesets in Game Options window, the Game Script settings window and AI settings window (#11512)
Add: [Emscripten] Support for bootstrapping (#11109)
Add: Hotkey to focus town / industry directory filter box (#11030)
Add: Maximum number of companies allowed to the client list (#10523)
Add: Use specific error message when vehicle cannot go to station/waypoint (#10494)
Add: Show NewGRF name in NewGRF-created errors (#10457)
Add: Alternative setting for right-click close window option to exclude pinned windows (#10204)
Add: Allow autoreplace with same model vehicle (#7729)
Add: [NewGRF] Allow inspection of road tiles and airports (#11282, #11323)
Add: [NewGRF] Station variable 6B to get extended station id of nearby tiles (#10953)
Add: [NewGRF] String code "9A 21" to display force from textstack (#10782)
Add: [NewGRF] Station property 1C/1D to set name/classname (#10672)
Add: [Script] Optional filter parameter to ScriptXXXList constructors (#11698,#11663)
Add: [Script] AI/GS Time Mode to choose between economy (default) and calendar time (#11603)
Add: [Script] Allow to set max loan for each company separately (#11224)
Add: [Script] GSIndustry.GetConstructionDate() method (#11145)
Add: [Script] Game script control of industry production level and news messages (#11141)
Add: [Script] GSAsyncMode to set async mode of gamescript commands (#10913)
Add: [Script] GSCompanyMode::IsValid and IsDeity, and enforce valid company/deity mode where applicable (#10536, #10529)
Add: [Script] Allow GS to found town with random road layout (#10442)
Add: [Script] Create own Randomizer per instance (#10349)
Change: Better handle different GUI sizes for most windows, and squash inconsistencies between windows
Change: Allow configuring AI slots above the current maximum number of competitors (#11961)
Change: Forcefully enable prefixing logs with date (#11930)
Change: Position error window closer to cursor on large screens (#11923)
Change: Only open story-book in center when a GS does it (#11916)
Change: Rebrand Cheats as Sandbox Options (#11874)
Change: Make smooth-scrolling based on actual time (#11865)
Change: Set smooth-scrolling on by default (#11860)
Change: Disable building rail infrastructure if train build limit is zero (#11847)
Change: Invalidate music volume when restarting music playback on Windows (#11836)
Change: Make street lights transparent with houses (#11828)
Change: Redesign script debug window (#11782)
Change: Reorganize Settings menu items (#11683)
Change: Set amount of smoke/sparks to "realistic" by default (#11624)
Change: Show a message in livery window if vehicle type has no groups (#11617)
Change: Add distinct tooltips for vehicle group colour schemes (#11617)
Change: Move colour selection dropdowns to bottom of window (#11617)
Change: Support custom transparency remaps with 32bpp blitters (#11616)
Change: Make "middle" the default stopping location for trains in platforms (#11605)
Change: Scale sprites to requested highest resolution level (#11600)
Change: Allow opening multiple script debug windows by holding Ctrl (#11592)
Change: Don't show scoring year in high score table (#11546)
Change: Revert pressed-button content shifting introduced in r2161 (#11542)
Change: Show rating in station list even with no cargo waiting (#11540)
Change: Hide unused cargos from vehicle cargo filter (#11533)
Change: Don't restart playback when toggling playlist shuffle (#11504)
Change: Increase finance window lines (and underlines) with interface scale (#11459)
Change: Move baseset missing/corrupted files label to list item (#11455)
Change: Add horizontal scrollbar to Industry Directory window (#11434)
Change: Improve layout of airport, dock, object, road/tram stop, train station pickers (#11430)
Change: Display cargo lists in sorted cargo order (#11383)
Change: Link houses production on industry chain graph by TPE_PASSENGERS or TPE_MAIL cargo (#11378)
Change: Passenger subsidies are generated for any TPE_PASSENGER cargo type (#11378)
Change: Towns generate cargo based on town production effect (#11378)
Change: Always allow expanding towns in Scenario Editor to build new roads (#11377)
Change: Don't set vehicle on time if timetable not started (#11359)
Change: Store station blocked/wires/pylons flags in map (#11337)
Change: Recover when possible from crashes during a crash (#11238)
Change: Store crash logs in JSON format (#11232)
Change: Remove autosave from settings window; it is already in the Game Options (#11218)
Change: Enable "Forbid 90 degree turns" setting by default (#11160)
Change: Do not allow mixing road/tram types in powered road type list (#11148)
Change: Only show platform stopping location in orders when other than default (#11102)
Change: Autorail / autoroad tools can start dragging from invalid tiles (#11089)
Change: Only allow buying Exclusive Transport Rights when no one has them (#11076)
Change: Remove currency code/symbol suffix from language files (#11061)
Change: Add separate setting for server sent commands per frame limit (#11023)
Change: Cargo flow legend only shows defined cargo (#10872)
Change: Use "Via-Destination-Source" as default station cargodist display (#10851)
Change: Preserve orders and related settings where possible when moving engines around in a train (#10799)
Change: Standardise unit conversions and allow decimal places (#10795)
Change: Use separate names for default stations/roadstops (#10786)
Change: [MacOS] Require at least 10.15 to run the game (#10745)
Change: Hide all variants from UI when (display) parent is hidden (#10708)
Change: Split Game options into General, Graphics and Sound tabs (#10674)
Change: Extend entity override manager and station spec lists to support 16 bit IDs (#10672)
Change: Base autosaves intervals on real time (instead of game time) (#10655)
Change: Allow overbuilding station and waypoint tiles (#10618)
Change: Use realtime for Linkgraph update settings (#10610)
Change: Make tick length 27 milliseconds (#10607)
Change: Increase max cargo age and let min cargo payment approach zero (#10596)
Change: Show buy company dialog window even when playing in the AI company (#10459)
Change: Use HTTPS for content-service connections (#10448)
Change: Big UFO disaster targets current location of a random train (#10290)
Change: Remove land generator setting from World Generation GUI (#10093)
Change: Build signals to the next junction when dragging regardless of the Ctrl state (#9637)
Change: Allow dedicated server to use threaded saves (#10787)
Change: [NewGRF] Increase vehicle random data from 8 to 16 bits (#10701)
Change: [NewGRF] Read Action 3 IDs as extended-bytes for all features (#10672)
Change: [NewGRF] Make Action 3 debug messages more consistent (#10672)
Change: [NewGRF] Extend callback 161 (engine name) with bit 0x22 for context 'Autoreplace - Vehicles in use' (#10666)
Change: [Script] Replace easy/medium/hard values with default value (#11959)
Change: [Script] Limit total script ops that can be consumed by a list valuate (#11670)
Change: [Script] Allow GS access to ScriptGroup, ScriptGameSettings.IsDisabledVehicleType, more ScriptCompany and more ScriptOrder functions (#10642)
Change: [Script] Improve ScriptText validation error messages (#10545)
Change: [Script] Restore support of {RAW_STRING} in ScriptText (#10492)
Change: [Script] Validate ScriptText parameters type and amount (#10492)
Change: [Script] Automate the ScriptObject reference counting (#10492)
Change: [Script] Extract params info from GS strings (#10492)
Change: [Script] A ScriptText with too many parameters is now a fatal error (#10483)
Change: [Script] Log AI/GS Squirrel crashes in white text for readability (#10375)
Fix #11918: Houses should only build next to road stops, not any station type (#11919)
Fix #11827: Make text layouter aware of ligatures (#11831)
Fix #11752: Characters could be repeated when wrapping multi-line text (#11761)
Fix #11748: Decreasing service interval value sufficiently would result in it wrapping around (#11749)
Fix #11629: Crash when getting the nearest town for rotated airports (#11631)
Fix #11516: Adjust window size by interface scale during ReInit (#11517)
Fix #11515: Changing interface scale could have unintended effects on zoom level (#11615)
Fix #11442: "Default" colour in group colour window is not updated when changing master colour (#11614)
Fix #11437: Flipped shorter rail vehicles disappear in windows (#11446)
Fix #11413: Incorrect sorting by industry production (#11414)
Fix #11407: Don't steal focus from dropdown menus (#11484)
Fix #11402: Make string filter locale-aware (#11426)
Fix #11329: Don't assert vehicle list length is non-zero when only asked to set string parameter (#11330)
Fix #11315: Sort industries and cargoes by name in industry chain window (#11317)
Fix #11307: Incorrect GroupStatistics after selling leading wagon (#11311)
Fix #11261: Airport menu selectability after closing window on a class with no available airports (#11344)
Fix #11230: Sort by button in group list window could be misaligned (#11231)
Fix #11215: Assert in NewGRF parameters window (manual parameter mode) (#11217)
Fix #11203: [Linux] Crash when editing CJK characters in edit box (#11204)
Fix #11180: Aircraft crashes could point to the wrong tile (#11184)
Fix #11164: Don't create duplicate town names when using 'Many random towns' in the scenario editor (#11165)
Fix #11162: Second company colour was not consistently applied to articulated vehicles (#11163)
Fix #11115: Focus the abandon game/exit game windows (#11125)
Fix #11096: Increase priority of error and confirmation windows (#11104)
Fix #11087: Disable base graphics/sound dropdown outside main menu (#11091)
Fix #11054: Prevent translation of currency codes (#11061)
Fix #11026: Use real engine name instead of default name for filtering (#11033)
Fix #10982: No help text for gamelog command (#10984)
Fix #10880: Crash in object window due to incorrect parameter order (#10881)
Fix #10868: Crash when Script tries to load large savegame data (#11029)
Fix #10811: Allow dragging vehicle in depot to any free row (#11508)
Fix #10660: Sprite Font scale affected by viewport zoom level limits (#10668)
Fix #10619: Crash loading linkgraph for older savegames (#10620)
Fix #10600: 'Replace Vehicles' didn't show numbers >999 (#10680)
Fix #10578: Allow to select any version of AI/GS from GUI (#10604)
Fix #10522: Link graph tooltip vertical lines were not handled correctly (#10524)
Fix #10511: Don't search for depot every tick if one cannot be found (#11548)
Fix #10478: Clarify airport noise control setting texts (#11169)
Fix #10452: Prevent long stalls during river generation (#11544)
Fix #10430: Display chain window causing assert (#10431)
Fix #10343: Don't extend town-disallowed roadtypes (#10347)
Fix #10251: [MacOS] Screen looks blue-ish when using newer SDKs (#11207)
Fix #10222: Adjust line drawing algorithm (#10491)
Fix #10131: Actually cancel downloads when pressing cancel (#10485)
Fix #10118: Cycle through current signal group, not just path signals (#11798)
Fix #10439: [Script] Validate story page button colour, flags, cursor and vehicle type (#11892)
Fix #10438: [Script] Validate story page element type for ScriptStoryPage::NewElement (#11888)
Fix #9865: Removing files with the console always failed
Fix #9810: Rebuilding a through road stop costs money (#9852)
Fix #9722: Crash when pressing hotkeys early in world generation (#11858)
Fix #9697: Limit the default width of the Online Players window (#11936)
Fix #9642: Keep infrastructure totals when overbuilding road depots (#11229)
Fix #9545: Crash when all cargo types are disabled (#11432)
Fix #8846: When upgrading NewGRF presets, copy NewGRF parameters only if the NewGRF are compatible (#11348)
Fix #8253: Improve profit graph when having lots of money (#11915)
Fix #6377: Two tarballs with the same folder in them were considered as one (#11855)
Fix #5713: Ships could be sent to unreachable depots (#11768)
Fix #4575: Use Latin 'l' in English translation of zloty (#11090)
Fix #4415: Land info build date is also renovation date (#11759)
Fix: Display rank correctly with more than 15 companies in a league table (#11940)
Fix: Extra refit button when train/RV is in a depot (#11904)
Fix: Update server listing as offline when unexpected disconnect during refresh (#11891)
Fix: Horizontal scale of framerate window switched excessively (#11813)
Fix: [Linux] Various issues with resolutions and fullscreen in multi-display setups (#11778, #11779)
Fix: Build button text when train purchase window using "Engines" filter (#11755)
Fix: One-way state remained after removing road from road and tram tile (#11745)
Fix: Draw video driver info at the correct size and text wrap (#10716)
Fix: Language genders could not be applied to SCC_INDUSTRY_NAME (#11697)
Fix: Spurious cancellations of HTTP content downloads (#11668)
Fix: Calculation of initial engine age was inaccurate (#11660)
Fix: Prevent underflow if engine base life is less than 8 years (#11635)
Fix: Changing default livery did not propagate to group liveries (#11633)
Fix: Window width/height was doubly-scaled with automatic DPI switch (#11598)
Fix: Don't crash when saving a crashlog save with no main window open (#11586)
Fix: Prevent overflow when calculating max town noise (#11564)
Fix: Deleting towns did not check for waypoints referencing the town (#11513)
Fix: Invalidate playlist window when (un)shuffling playlist (#11504)
Fix: Restore original cargo legend 'blob' dimensions (#11480)
Fix: Extmidi did not move on to next song after playing ends (#11469)
Fix: Server password length in the UI was unnecessarily limited (#11408)
Fix: OpenTTD can fail to exit on an error due to mutex locks in threads (#11398)
Fix: Scale minimum width for server name by interface scale (#11381)
Fix: Server connection was not closed when relay window was closed (#11366)
Fix: Upgrading NewGRF presets could result in incomplete display of NewGRF parameters until restart (#11348)
Fix: Check for engine variant loops during NewGRF initialization (#11343)
Fix: Don't allow industries to produce invalid cargo (#11314)
Fix: Also apply cargo filters on shared groups in vehicle listing (#11294)
Fix: Only count distance traveled in vehicles for cargo payment (#11283)
Fix: Base cargo payment on load/unload tile, instead of station sign location (#11281)
Fix: Crash when opening a damaged base-graphics (#11275)
Fix: Trivial autoreplace of mixed cargo articulated engines (#11253)
Fix: [Emscripten] Config not saved on exit (#11248)
Fix: Inaccurate waiting cargo total in station window when using cargodist (#11213)
Fix: No fast forward in network was ensured only from GUI side (#11206)
Fix: Crash when not passing command-line parameter for -n (#11153)
Fix: [Bootstrap] Don't crash when failing to connect to content server (#11122)
Fix: Crash when failing to load a game into a dedicated server at startup (#11021)
Fix: Don't allow changing settings over the network that are marked as local settings (#11009)
Fix: Move no_http_content_downloads and use_relay_service to private settings (#10762)
Fix: Extra viewport could not be scrolled with right-click-close (#10644)
Fix: Specify units for value of share trading age setting (#10612)
Fix: Road type is not available before its introduction date (#10585)
Fix: Do not update a RV's Z-position when stationary while turning (#10570)
Fix: Don't (briefly) switch from title-only playlist on menu screen (#10553)
Fix: Reset content download progress to zero if falling back to TCP (#10485)
Fix: Make script goals work with the whole range of ClientIDs (#10435)
Fix: [NewGRF] Tile slope missing from road stops varact2 variable 0x42 (#11373)
Fix: [NewGRF] House class mappings were not reset between games (#11279)
Fix: [NewGRF] Profile didn't stop if there were no events yet (#10816)
Fix: [NewGRF] Support more than 256 stations/waypoints/roadstops per class (#10793)
Fix: [NewGRF] Var68 for station and roadstop was broken (#10784)
Fix: [NewGRF] Object and road stop ignore property handlers (#10525)
Fix: [Script] Apply random deviation to settings only at script start (#11944)
Fix: [Script] Improve ScriptText validation (#11721)
Fix: [Script] GSAdmin.Send() could generate invalid JSON (#11250)
Fix: [Script] Crash if squirrel compatibility scripts cannot be parsed (#11589)
Fix: [Script] Don't list unavailable road types for game scripts (#10585)
Fix: [Script] Game scripts were able to build with non-existing road types (#10539)
Fix: [Script] Inconsistent precondition failure return values (#10533)
Fix: [Script] Crash when companies disappear (#10529)
Fix: [Script] ScriptBase::Rand() return value could return negative values (#10443)
Fix: [Script] Incorrect value for GOAL_INVALID (#10436)
Fix: [Script] Extend Script::IsValidVehicle to check for primary vehicles (#10386)
Remove: "generation_seed" from config, as it was a write-only value (#11927)
Remove: Debug redirect over network (#11776)
Remove: Officially mark Vista as no longer supported (#11531)
Remove: OS/2 and SunOS ports (#11018, #11210)
Remove: Obsolete NewGRF text unprinting (#10884)
Remove: [Script] CONFIG_RANDOM from AddSetting flags (#11942)

Download: OpenTTD v14.0-beta1
Source: Here