OpenTTD v1.9.0-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:
1.9.0-beta2 (2018-02-09)
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- Fix: Non-Windows builds did not get correct git hash

1.9.0-beta1 (2018-02-09)
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Note: OpenTTD was migrated to GitHub for 1.9, so SVN revision and FlySpray numbers have been replaced with Pull Requests and Issue numbers
- Feature: Group liveries, and livery window usability enhancements (#7108)
- Feature: Overhaul of music system, support MPSMIDI music files (TTD DOS/TTO) (#6839)
- Feature: [Win32] Rewritten DMusic and WinMM music drivers
- Feature: [Win32] New XAudio2 sound driver
- Feature: [Linux] New Fluidsynth music driver
- Feature: Framerate display window (#6822)
- Feature: [NewGRF] Ability for industries & houses to produce and/or accept up to 16 different cargoes
- Feature #6610: Allow towns to build houses on road turns (#6758)
- Feature: Replace independent map scrolling GUI settings with single option, and add choice to not lock cursor position when scrolling (#6756)
- Feature #6459: API for querying network clients from GS (#6736)
- Feature: New Russian Ruble & Mexican Peso as currencies (#6678, #7035)
- Feature #4186: Append '(City)' after city names in the town directory
- Feature #986: Automatic save when losing connection to a network game
- Add: [NewGRF] Flag to hide rail types from construction (#7118)
- Add: [NewGRF] Airport animation trigger for plane landing (#6334)
- Add #4115: Default starting company colour setting (#6998)
- Add: Mixer feature for streaming sampled music
- Add #6460: [AI] start_date parameter for Random AIs on new game
- Add: BACKSPACE can be mapped as a hotkey
- Add: 32bpp SSE2 blitter palette animator (#6795)
- Change: Make ships turn slowly when changing direction and stop when going up or down a lock (#7065, #7150)
- Change: Improve ship pathfinder performance
- Change: Decouple GUI timing from game ticks (#6780)
- Change: Desert tiles are now half-desert if a neighboured tile is non-desert or sea/coast (#4754)
- Change: Gradually slow down aircraft speed on breakdown (#6932)
- Change: [NewGRF] Increase rail type & cargo type limits to 64
- Change: [NewGRF] Increase size of persistent storage to 256
- Change: [NewGRF] Use last OpenTTD SVN revision in NewGRF version number (#6843)
- Change: Clone tool in depot window now behaves like clone button in vehicle window (#6754)
- Change #6397: Keep town growth rate in sync with house count
- Change: Scale default FreeType font size selection by UI zoom level
- Change: [OSX] Reversed pinch to zoom behaviour
- Change: Switch town growth rate and counter to actual game ticks (#6763)
- Change: Non-tag revisions are now named '--g'
- Change: Rewrite several bits of documentation in markdown
- Fix: Reinitialise graph GUI on game restart (#7191)
- Fix: Potential crash during shutdown after unpacking downloaded content (#7185)
- Fix #6584: Text layout in engine preview dialogue
- Fix #6636: Airplanes could be sent to helicopter station depots
- Fix: Deadlock when launched with -n switch (#7103)
- Fix: Various corrections to town names in non-English languages (#7038, 7141)
- Fix: Only consider airport tiles when placing (for non-rectangular airports) (#6613)
- Fix: Spelling fixes on some Latin American town names
- Fix #7001: Pathfinders should see standard road stations as tiles where to reverse
- Fix #6676: Prevent helicopters from stopping in midair during some kinds of landing
- Fix: Remove need to use Ctrl+Click when building stations next to competitors (#6906)
- Fix: [NewGRF] Make VA2 operator 11 (ror) behave well-defined when rotating by 0 bits
- Fix #4109: Add more water checks to the Oil Rig layout
- Fix #6938: Incorrect value for "Cost to Clear" was displayed for Company Headquarters in tile inspector (#6939)
- Fix #6920: Make 9.8m/s^2 a common constant for TE-calculation
- Fix #6892: [Script] CONFIG_RANDOM did not use the full parameter range (#6902)
- Fix #6622: News message when GS constructs a town had empty company name
- Fix: [NewGRF] Action7 variable 0x85 had no bounds checks
- Fix #6875: Depot building cost did not include foundation build cost (#6883)
- Fix: Some pixels in ship autoreplace icon (sprite 106) were transparent
- Fix: Poor contrast in cargo dest flow legend window cargo labels
- Fix #6553: Make viewport button text unambiguous
- Fix: [OSX] Setting mouse-wheel to scroll the map does not disable pinch to zoom
- Fix #6969: Account for BOM when reading script files
- Fix #6898: Ability to use seeds above INT_MAX (#6936)
- Fix #6659: Bus stations could be demolished when not in demolish mode (#6815)
- Fix: One-way roads could be over-built by road stops regardless of road owner
- Fix: Use name of cargo instead of Passengers/Mail in town statistics (#6801)
- Fix: Prevent ships moving into docks after finishing (un)loading (#6791)
- Fix: Tractive effort was slightly too high as per NewGRF spec (#6785)
- Fix #6465: Add {NORMAL_FONT} and {MONO_FONT} control codes to GS strings (#6726)
- Fix: Four group action icons were misplaced and cropped
- Remove: PSP, WinCE support

http://www.emucr.com/2019/02/openttd-v190-beta2.html

http://www.openttd.org/