CrossFire Reloaded
Published: December 9, 2008

Buy turrets, missile launchers, mortars, airstrikes, mines etc. and deploy them to defend your base. Kill and crush coming enemies using your turrets and stuff. You must survive at all costs, Commander.
65 missions, 10 types of towers, losts of enemies, different game modes, map editor for more fun.
Freeware. Minimum system requirements, 7Mb to download.