Freedom3D_GM
full-blown GTA 3 -SA clone. Done in Game Maker. No missions though
...Done in Game Maker. The game implements relistically the possibility to get in various vehicles and go around, jump (also on houses and ramps). This is a sort of reference that shows to also to the geenral public (so not only C/C++ programming nerds) how such a thing is made: vehicles on hilly terrain, obstacles, and collision with them... environment with optimised viewdistance and day/night cycle (so I mean atmosphere).