OpenTTD v1.10.0-RC1 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: Allow server to supply a reason to kicked/banned clients (#7859)
Feature: [NewGRF] Station variable 6A, querying GRFID of nearby station tiles (#7956)
Feature: Improved logic of sharing industry production between 3 or more stations (#7922)
Feature: Highlight the item under mouse cursor in file browser (#7900)
Feature: [GS] Methods to change town rating of companies (#7898)
Feature: [NewGRF] Callback profiling command (#7868)
Feature: Add a setting to show the name of the NewGRF of a vehicle in the build window (#7852)
Feature: Ability to filter industry directory window by cargo (#7843)
Feature: Minimap screenshot type (#7817)
Feature: [GS] Methods to control engine availability of a specific company (#7791)
Feature: Configurable game ending year (#7747)
Feature: Separate window for taking screenshots (#7550)
Change: Move autorenew setting to basic category (#7984)
Change: Improved algorithm for transfer feeder payments (#7935)
Change: Show volume sliders with wedges instead of boxy slider (#7902)
Change: Auto-restart loads the original resources (e.g. save or scenario) again (#7688)
Change: Improve readability of integer lists saved to config files (#7396)
Fix #7976: Crash when attempting to kick the host via rcon (#7985)
Fix #7592: Road vehicles no longer balanced between multiple road stop stations (#7979)
Fix: Station rating effects affecting too large area (#7977)
Fix #7974: Crash when Ctrl+click to show a collapsed vehicle group (#7975)
Fix #7969: Crash when executing a recursive console alias (#7973)
Fix #6566: Very long loading of the maximum "zoom out" level at high resolutions (#7968)
Fix #7952: Crash when switching input languages (#7953)
Fix: [OSX] Don't show a crash/assertion message box for a GUI-less video driver (#7934)
Fix #7925: Corrupt savegames could lead to corruption of the titlegame (#7932)
Fix: [Fluidsynth] Music notes from previous song were not properly reset (#7930)
Fix: Invalid string usage within music window (#7928)
Fix: Non-deterministic name sorting in industry directory window (#7915)
Fix #7899: Various issues with town list window sorting (#7906, #7916)
Fix #7587: Fix possible crashes when loading old save games with invalid waypoint positions (#7894)
Fix: Avoid a crash by properly resetting timetable duration when loading old savegames (#7894)
Fix: Possible crash when post road-works cleanup removes all road pieces (#7903)
Fix #7891: Fix crash when loading save from 1.7.2 (#7892)
Fix #7887: Missing sound effects for some main toolbar buttons (#7888)
Fix #6667: Avoid confusion by also recalculating bridge costs for 'spectated' AI companies (#7884)
Fix: Allow old NewGRF industries to hide in/out cargo slots (#7882)
Fix: [Windows] Fix bootstrap GUI with Uniscribe but no Freetype (#7878)
Fix: Missing keycodes for hotkeys.cfg (#7850)
Fix #7625: Ensure road infrastructure cost is correctly updated when upgrading your own roads (#7628)
Fix #7088: Avoid crash by closing AI/GS textfile windows when changing their in-game slot (#7094)

Download: OpenTTD v1.10.0-RC1
Source: Here