key features of dcs world 2.5 Open Beta:

The most realistic Free-to-Play digital battlefield ever.
Fly the TF-51 Mustang and Su-25T attack jet for free!
Includes a free 117,000 sq nautical mile Caucasus map with millions of buildings and trees.
Includes 156 free and fully operational weapons systems, 105 ground vehicles, 19 ships and 84 AI-controlled aircraft.
Both hardcore realistic and casual gameplay modes and options available.

One-of-a-kind, internally developed graphics engine that looks amazing from 0 to 80,000 feet.
Includes a beautiful, free, and highly detailed map of the Caucasus region that includes south western Russia and Georgia.
Includes 20 fully-equipped operational airbases, millions of buildings and trees, and thousands of kilometers of usable roads and railway.
Play all DCS World modules from one DCS World version.
State-of-the-art graphics with amazing lighting, shadows, and performance.
New breathtaking effects for explosions, clouds, fog, fire, and smoke.
Create your own missions and campaigns for unlimited gameplay!
Mission generator included allowing rapid mission creation.
Enjoy multiplayer with friends, and even fly together in the same aircraft for multi-crew missions!
Purchase and fly the most iconic airplanes and helicopters from WWII up to the modern day.
Mouse interactive 6 degrees of freedom cockpits for most aircraft and the most accurate flight models, cockpit systems, sensors, targeting systems and sounds available.
Purchase and fly the most authentic simulations of the A-10C Warthog, UH-1H Huey, F-86F Sabre, Spitfire, and many others now.
Exciting new aircraft coming to DCS World like the F-14 Tomcat, F/A-18C Hornet, F-4E Phantom II, Mi-24P Hind, P-47D Thunderbolt, and many more!
Purchase additional high-quality maps such as Normandy 1944 and the Nevada Test and Training Range.
Play hundreds of missions and campaigns with new campaigns continually created.
Virtual reality support.