OpenTTD v1.7.0 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 v1.7.0 RC1 Changelog:
- Feature: [NewGRF] Extend the DCxx range to D800-DFFF (r27769)
- Feature: [NewGRF, script] Increase the maximum number of GameScript texts to 64k, and NewGRF texts to 512k (r27758)
- Feature: [NewGRF] CB 37 results 0x0401 and 0x0800-0BFF for improved control of display of input cargos in the industry GUI (r27751)
- Feature: Sprites missing in outdated basesets are now provided by openttd.grf (r27732, r27731, r27730)
- Feature: [NewGRF] String command 9A 1E to print the name of a cargo type (r27707, r27706)
- Feature: [Debug] Assign descriptive names to threads [FS#6471] (r27674, r27673, r27670)
- Feature: [NewGRF] Allow composing vehicles from multiple sprites (r27668)
- Change: Enable realistic train and road vehicle acceleration by default (r27760)
- Change: Hide the drive-in stops from the tram station picker (r27734)
- Change: Do not count static NewGRF when checking for the maximum number of NewGRFs in a game (r27729)
- Change: Limit waypoint area by maximum station spread during dragging (r27710)
- Change: [Build] Re-enable Wnarrowing for gcc 4.9+ [FS#6532] (r27709, r27703)
- Change: List railtype of rail tiles explicitly in the tile info window (r27686)
- Change: Re-arrange the autoreplace GUI for trains, and do not filter it by railtype by default (r27683)
- Change: Various performance improvements to CargoDist and LinkGraphs (r27682, r27681, r27614, r27613, r27612, r27611)
- Change: Improve randomisation of rough land appearance (r27657)
- Change: [Build] Enable C++11 for clang 3.3 (r27654)
- Fix: Insufficient thread synchronisation when switching blitters lead to crashes [FS#6510] (r27775)
- Fix: Enabling palette animation for 32bpp blitters while paused skipped initialisation of the palette and resulted in black windows [FS#5889] (r27774)
- Fix: Intro games other than the traditional nightly one would cause townname NewGRFs to not get activated in the game options [FS#5819] (r27772)
- Fix: Some variables were not reset between loading old savegames, which made loading them fail [FS#6540] (r27770)
- Fix: Removing secondary roadtypes from bridges was factor 2 too cheap [FS#6538] (r27746)
- Fix: Extra viewports did not center on the selected tile [FS#6537] (r27743)
- Fix: [Build] Building on newer OSX versions with newer SDKs [FS#6295, FS#6502] (r27727, r27675)
- Fix: Improve error message when trying to build rail track over a depot (r27726)
- Fix: Rescanning NewGRF in-game could break the loaded NewGRF, if very many NewGRF were in use (r27721)
- Fix: Text could overflow various GUI elements [FS#6527] (r27713)
- Fix: Memory leak when reloading NewGRF (r27690, r27688, r27687)
- Fix: When removing objects of bankrupt companies the tiles may revert to canal. In that case also check the ownership of the canal [FS#6511] (r27656)
- Fix: Make the console file commands operate independent of the save/load GUI (r27645)
- Fix: When dragging vehicles in group or depot GUI, draw the complete articulated vehicle (r27632)
- Fix: When dragging multiple vehicles in the depot, make the destination gap as long as the chain instead of just considering the first vehicle (r27629)
- Fix: [Build] Change the GCC version detection so that it works with two-digit and truncated versions [FS#6487] (r27623, r27616)
- Fix: Do not hide filtered and highlighted industries by overlapping tiles in the zoomed-out smallmap (r27622, r27621, r27620)
- Fix: [Script] Kill scripts, when a non-suspendable valuator call takes way too long [FS#6473] (r27594)

Download: OpenTTD v1.7.0
Source: Here