I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
Operation Flashpoint. The tactical military combat simulation, under development with Bohemia Interactive Studio, is probably the most complex wargame experience ever. Unprecedented freedom of action integrates squad command, piloting of any vehicle and strategic decision-making, to totally immersive effect.
Complete infantry, mobile armour and aircraft in one single tactical game. Command up to 12 units through treacherous do-or-die missions. Immense, highly detailed and accurate 3D environments with the best visual representation of modern military ever seen. Non-linear campaign strengthened by cinematic voice-over and animated cut-scenes. Built-in full-featured mission editor enabling gamers to create and share missions and campaigns. Multiplayer combat over LAN and Internet with full support of command options, all types of units and mission editor.