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 (to purchase) as well as user-made add-ons and mods.

Download it from STEAM or at the Official Site

Recommended system requirements: Operating system 64-bit: Windows Vista and 7; Processor: CPU: Core 2 Duo E8400, AMD Phenom X3 8750 or better; Memory: 4GB; Hard disk space: 7 GB; Video: Shader 3.0 or better; 896MB NVIDIA GeForce GTX260 DirectX 9.0c or better; Sound: DirectX 9.0c – compatible; DirectX: 9.0C; requires internet activation.

Minimum system requirements: Operating system: Windows XP, Vista or 7; Processor: Core 2 Duo 2.0 GHz; Memory: 3 GB; Free hard disk space: 7 GB; Video: 512 MB RAM card, DirectX 9 – compatible; Sound: DirectX 9.0c – compatible; requires internet activation.