A nearly complete Populous clone I made for one of my university projects, I never quite got around to finishing it as time ran out, it needed handing in and I moved onto other projects (like my dissertation). the 5000 levels are all there though, shame there's no sound.
Populous3D is an OpenGL/Glut program if you dont have glut installed get it here and stick the dlls in your windows/system folder. the map area tends to mess up on a lot of graphics cards. mainly those that don't like OpenGL fiddling with texture.