OpenTTD v12.0-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: [Network] Remove lobby window; pressing "Join Game" now immediately joins a server (#9467)
Feature: [Network] Synchronize server name to clients and display in Online Players window (#9472)
Feature: [Network] Mention you are a spectator in the status bar (#9471)
Feature: [Network] No longer require port-forwarding to host a server (#9443, #9447)
Feature: [Network] Allow setting your server visibility to "invite-only" (#9434)
Feature: [Network] Join servers based on their invite code (#9432)
Feature: Raise the maximum NewGRF limit to 255 (#9428)
Feature: Persistent rotation of numbered auto/netsave after restart (#9395, #9397)
Feature: [NewGRF] Maximum curve speed modifier for rail vehicles (#9346)
Feature: Move sensitive information to secrets.cfg and private information to private.cfg (#9298)
Feature: Signed Windows builds (#9294)
Feature: [NewGRF] Define refittability of default vehicles using cargo classes (#9148)
Feature: Configurable subsidy duration, up to 5000 years (#9081)
Feature: [Network] Rework in-game Online Players window (#9067)
Feature: [Network] Show previous chat history when the chat message box is open (#9025)
Feature: Button to reset game settings to their default values (#8958)
Feature: Press Ctrl to build diagonal rivers in Scenario Editor (#8880)
Feature: Set wagon replacement per group when using autoreplace (#7441)
Add: [Network] Open Online Players window on starting/joining a server (#9479)
Add: [Script] Basic information about loaded NewGRFs for scripts (#9464)
Add: [AI] Get the number of vehicles in a given group (#9462)
Add: [Network] Inform network clients what game-script a server is running (#9441)
Add: Hindi translation (#9086)
Add: [Network] Ensure players fill in a name instead of defaulting to "Player" (#9080)
Change: Allow pause/unpause console command in single player (#9342)
Change: Make savegame format self-descriptive and consistent across all objects (#9322, #9335, #9338, #9339)
Change: By default, make "unload all" leave stations empty (#9301)
Change: Reworked the debug levels and messages for network logs (#9230, #9251)
Change: [Emscripten] Set default scrolling mode to non-pointer-locking (#9191)
Change: Use neutral pronouns for various strings (#9189, #9203, #9228)
Change: Make the town directory horizontally resizable (#9157)
Change: Allow non-ASCII currency separators (#9121)
Change: [NewGRF] Display a pop-up window for Errors with severity ERROR (#9119)
Change: Treat languages as finished, if translations are 75% completed (#9019, #9086)
Change: Disable NewGRF window apply button if no change was made (#8934)
Fix: [Script] Crash when iterating lists of which the key is larger than 32bit (#9465)
Fix: [Network] Desync due to use of unstable sort when distributing cargo production (#9460)
Fix #9440: Negative cargo payments not being handled correctly (#9455)
Fix: [Network] Crash when joining a server again after a TCP disconnect (#9453)
Fix: Don't enable rename button for network clients in build vehicle window (#9452)
Fix: Money could underflow and wrap around (#9451)
Fix: Parse the console settings the same way as config settings (#9438)
Fix: Ensure no more than the allowed number of NewGRFs are loaded from the configuration (#9430)
Fix: [NewGRF] Overflow when determining cargo mask for string code 9A 1E (#9423)
Fix: Integers for scripts are 64bit, but saved as 32bit (#9415)
Fix #9392: [Script] Return a valid value with GetBuildWithRefitCapacity even when AIs are maxed out in vehicles (#9393)
Fix #8169: Crash when autoreplacing vehicle with no orders (#9387)
Fix: Wrong cargo line position in IndustryCargo window (#9383)
Fix: Race-condition during startup of NewGRF scan (#9382)
Fix: Don't propagate Shift/Ctrl state till next game-tick (#9381)
Fix: Prevent palette updates during copying to the video driver (#9379)
Fix: [Network] Determining GetNetworkRevisionString could overflow and underflow its buffer (#9372)
Fix #9358: Don't skip empty files in tar archives (#9367)
Fix: For old savegames, station bus/truck station cache was not updated (#9366)
Fix #9353: [Script] Garbage collecting on priority queues could crash the game (#9356)
Fix: Respect the autosave_on_exit setting for Null video driver (#9343)
Fix: Compatible NewGRFs in crash-log reported wrong MD5 hash (#9340)
Fix: [Script] Ensure the saved script strings are properly validated and terminated (#9336)
Fix #9316: Town bridge length limit check incorrect above 250k inhabitants (#9318)
Fix: Limit heightmap sizes to 8192x8192 (#9307)
Fix #9281: Money generating exploit when buying out a company (#9300)
Fix: Part of a tile might not be redrawn when terraforming (#9296)
Fix: [OpenGL] Increase timeout when waiting for the GPU to be done with the drawing buffer (#9282)
Fix: Vehicles sent in the wrong direction if there is no path to the destination (#9280)
Fix #9264: Do not attach temporary wagons to free wagon chains when autoreplacing (#9278)
Fix #9267: [Script] Crash during garbage collection (#9275)
Fix: Encountering two-way red signals could prune unrelated Pathfinder branches (#9271)
Fix #9255: [Network] Crash when hostname is not found (#9259)
Fix #9256: Invalid read after free when replacing train chains (#9258)
Fix: [Emscripten] Force secure WebSockets over HTTPS (#9248)
Fix #9242: Tree tick handler did not scale by map size (#9246)
Fix: [Network] Mark server as offline when no longer reachable (#9244)
Fix: [Network] Don't rebuild the host-list during iterating the list (#9240)
Fix: [Network] Don't mark the last-joined server as a manually added server (#9239)
Fix: [Network] Clients leaving because of broken connections was not broadcasted (#9238)
Fix: [Network] Check on CIDR for netmask check considered everything valid (#9235)
Fix: Creating screenshots on dedicated servers failed (#9232)
Fix: Leaking file descriptors for downloaded content (#9229)
Fix: Spelling of several town names (#9222)
Fix #9209: Game hangs when resizing highscore/news window if the screen is too small (#9210)
Fix: [Network] Optimize creating network connections for clients using IPv4 and IPv6 (#9199)
Fix #9186: Fix incorrect bounding box height causing station sprite glitch (#9187)
Fix: Truncating strings in settings could leave invalid UTF-8 characters (#9121)
Fix: Many issues related to window scaling (#9087, #9219)
Fix: Invalidate cached vehicle colourmaps when changing liveries setting (#9006)
Fix #8981: Don't attempt to re-reserve path if already entering/entered depot (#9000)
Fix: Missing 'Town names:' colon in map gen GUI (#8986)
Fix: Sorting and filtering industries that produce/accept many cargoes (#8468)
Remove: [Network] COMPANY_INFO packets (#9475)
Remove: [Network] A server can no longer set a limit to the amount of spectators allowed (#9466)
Remove: Arbitrary limit on number of statically loaded NewGRFs (#9431)
Remove: [Network] Language and map-name from server information (#9070)

Download: OpenTTD v12.0-beta1
Source: Here