FlightGear

This release improves interaction with airfield layouts for "manual" and AI traffic, uses more realistic cloud rendering, gives the launcher a nicer look and more features, makes CMake the official build system, gives a nicer visual appearance to ground features, and adds a lot of bugfixes and general improvements.

An extensive overhaul of many components was done.

Major realism improvements were made in the
helicopter Flight Model. Gliding with winch
launching and aerotowing (YASim) was improved.
Support for water planes was added. Multiplayer
chat (text and voice) was added. The tutorial
system was improved. Viewpoints were improved,
including a fly-by view and a dynamic cockpit
view. Interactive/scripted control of AI aircraft
was added. TACAN was added for easier air-to-air
refueling. KC135 can be AI or flown by a player on
the Multi-Play servers. Many new and improved
aircraft are available.

A gigantic number of new aircraft, new features,
enhancements to existing models, and bugfixes were
added.

New plane models, 3D clouds, volumetric shadows,
seasonal terrain textures, air carrier operations,
more weather effects, redout/blackout on high G
loads, heat haze, and more AI capabilities were
added. A major rework of the multiplayer code was
done, with a WWW-based multiplayer server status
page (based on the Google Map). The GUI was also
reworked, and is more friendly to new users now;
the ATC dialogs no longer impede flying. A lot of
bugs were fixed.