OpenTTD v15.0-beta2 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: Snow-covered rocks are now visible (#13627)
- Feature: Generate more rocks on steep slopes during map generation or heightmap import (#13462)
- Feature: Prevent towns from upgrading individually-placed houses (#13270)
- Feature: [Win32] Touchpad two-finger map scrolling (#13172)
- Feature: NewGRF Badges (#13073)
- Add: [NewGRF] Add road-/tram-/rail-type variable 0x45 to get mutual road-/tram-/rail-type on same tile (#13934)
- Add: [Script] Newer Cargo Classes (#13779)
- Add: Show hyperlink destination tooltips in text window (#13742)
- Add: [Script] Saving/loading ScriptList (#13556)
- Add: Press Ctrl to build diagonal canals in game mode (#13432)
- Add: Sandbox settings to Sandbox Options window (#13268)
- Add: Setting to allow placing houses manually in-game (#13266)
- Add: [Script] Event for when a company's president name changes (#13208)
- Add: Ability to toggle visibility of station signs by facility (#13207)
- Add: [Script] ScriptEventCompanyRename (#12878)
- Add: Ukrainian Hryvnia currency (#12877)
- Add: Convert 32bpp-only sprites to 8bpp when needed (#11602)
- Change: [Script] Start GS (but don't run it) when generating world in scenario editor (#13961)
- Change: Make tree placement at world generation look more organic (#13515)
- Change: [MacOS] Put the icon in a rounded rectangle (#13446)
- Change: [Script] GetWaypointID to return the StationID of any waypoint (#13407)
- Change: Draw company manager face jacket after collar (#13390)
- Change: Don't distinguish between bus and truck stops when removing them (#13384)
- Change: [Script] Rename BridgeID to BridgeType in the script API (#13352)
- Change: Add fonts document to help window (#13305)
- Change: Log changes to sandbox settings (#13267)
- Change: When player joins network company, use its name instead of number in chat (#13263)
- Change: [Win32] Draw window title bar according to current Windows light/dark theme (#13196)
- Change: Restore wider spacers in main toolbars (#12039)
- Fix: NewGRF Global variables 0D, 0E and 1E refer to wrong GRFFile (#13986)
- Fix #13980: Allow diagonal selection for road convert (#13983)
- Fix: Validate raw strings from game-scripts, and strip invalid and control characters (#13976)
- Fix: Capitalise "Disabled" for the "maximum non-sticky open windows" setting (#13975)
- Fix: Frame widget with label had incorrect spacing (#13967)
- Fix: StringFilter included quotes in the search and failed (#13965)
- Fix #13955: Make graphs respect RTL (#13957)
- Fix: Numbers were left-aligned for RTL languages in several windows (#13959)
- Fix: MayHaveRoad claimed rail station tiles had road, so the custom stationspec index would be read as roadtype (#13949)
- Fix: [Script] Prevent cloning of API instances (#13947)
- Fix: Reference to the correct section of the README, if a graphics or a sound set is incomplete (#13946)
- Fix: Draw the bevel around the music track name as inset (#13935)
- Fix #13923: Padding in music GUI was asymmetric, so it looked different for LTR and RTL languages (#13933)
- Fix #13928: BuildOilRig did not properly set airport rotation (#13929)
- Fix: SDL2 application name hint was not effective (#13926)
- Fix #13921: [Win32] Don't try close an already closed event handle during destruction (#13924)
- Fix #13921: Don't reject MIDI files with a valid file magic value (#13924)
- Fix #13912: Multitile buildings break apart in house picker (#13914)
- Fix #13908: Require double click on order to change stop location (#13913)
- Fix #13910: Invalidate content of house picker window if language is changed (#13911)
- Fix: [Script] Reset instance when changing running scripts in scenario editor (#13906)
- Fix: [Script] Only run the gamescript GameLoop() in-game (#13896)
- Fix #13893: Reversed all x-axis labels for company related and industry production graphs in wallclock mode (#13894)
- Fix #13842: Close industry production graph if industry is removed (#13890)
- Fix #11528: Starting autorail dragging from existing track tiles resulted in adding non-continuous tracks (#13885)
- Fix: Autoreplace rail/road list only listed buildable types (#13887)
- Fix: [NewGRF] Display an error, if NewGRF reference out-of-bounds string parameters in gender/plural choices (#13881)
- Fix #13849: Settings in old saves could be overridden by defaults (#13874)
- Fix #13562: Removed cost estimation message from money cheat (#13857)
- Fix: [NewGRF] Plurals and genders did not work in strings with cases or substrings (#13853, #13852)
- Fix: [NewGRF] String parameter stack and case selection were not processed for control code 0x81 (#13851)
- Fix #13839: Incorrect colour of first company legend in smallmap window (#13841)
- Fix: i circumflex width in TrueType small font (#13836)
- Fix: Don't show owner of non-existent road (#13824)
- Fix: Error message window timeout doesn't match setting (#13812)
- Fix #13795: Crash in vehicle list of 32-bit platforms (#13796)
- Fix: [Script] Company rename event sometimes had the wrong name (#13794)
- Fix: Improve manager face randomisation (#13776)
- Fix #13740: [Script] Handle implicit orders for jump orders (#13753)
- Fix #13749: Default service intervals were not updated when changing timekeeping unit (#13751)
- Fix #13725: Use proper query strings for changing timetable values (#13737)
- Fix #11226: Don't draw story page elements that won't be visible (#13736)
- Fix: More AI than max_no_competitors could start with competitors_interval=0 (#13670)
- Fix: League table window ignored the minimal size in its widget description (#13629)
- Fix: Incorrect snow density when making rocks snowy (#13626)
- Fix: NewGRF vehicles display loading sprites when not actually loading or unloading (#13554)
- Fix #12925: Prevent cost estimates for settings changes (#13550)
- Fix: [Script] Report errors happening during 'Load()' (#13537)
- Fix: [Script] Improve type checking of parameters (#13522)
- Fix: [Script] Don't set CommandCallback for asynchronous commands (#13501)
- Fix: Missing error messages with sell- and autoreplace-all commands (#13469)
- Fix: Too many trees when generating trees at same height (#13460)
- Fix #12912: Company inaugurated year in wallclock mode was not saved (#13448)
- Fix: [Script] Wrong return value for failed preconditions Vehicle::CloneVehicle (#13445)
- Fix #13140: Scale initial industry production estimate by cargo scale (#13427)
- Fix #13384: Crash when remove bus/truck stop tool used on road waypoints (#13391)
- Fix #12987: Historical houses now always spawn completed (#13332)
- Fix: [Win32] Font detection didn't work for locales not supporting code pages (#13306)
- Fix: Restore ability to disable service interval (#13281)
- Fix: Hide company settings from console commands (#13269)
- Fix: Disable service interval widgets for non-owned vehicles (#13260)
- Fix #13225: Cargo payment graph key toggled wrong data sets (#13226)
- Fix: Rail station tile flags were not set early enough (#13203)
- Fix #13199: -f command line parameter does not need a value (#13200)
- Fix: Missing water region invalidation after flooding a half tile with rail in the highest corner (#13047)
- Fix: Strip control codes before sorting NewGRF names (#13034)
- Fix #12968: Added back ability to create unremovable houses (#12989)
- Remove: Drop support for UCS2/UTF-16 encoded scripts (#13992)
- Remove: Support for SDL1.2 (#13298)

Download: OpenTTD v15.0-beta2
Source: Here