Digital Combat Simulator World (DCS World) is a free-to-play digital battlefield game, focusing on a military aircraft simulation. It includes a FREE Su-25T attack aircraft and it is extensible through additional DCS modules as well as user-made add-ons and mods.
DCS World includes a vast mission area of the Caucasus region that encompasses much of Georgia - the location of the Russian invasion of Georgia in 2008. Additionally, DCS World includes:
Powerful mission and campaign editors
Multiplayer
Massive inventory of air, land and sea combat units and weapons
Advanced AI
Fast mission generator
Dynamic weather and seasons
Training missions
Mission replay system
Pilot log book
This all allows the creation of engaging, real-world combat missions in this flashpoint region. DCS is a true "sandbox" simulation that can and will cover multiple time periods covering many types of combat and civilian units. DCS World allows both realistic game play and more relaxed game play to suit the player.
DCS modules that can plug into DCS World can include aircraft, maps, ground units, campaigns, etc. Not only can DCS World include modules developed internally by Eagle Dynamics, but it can also include those by certified third party developers. The first third party aircraft will be the UH-1H Huey.
Source: The Game Website.