A 3D scene editor for Ogre in Purebasic
Arkeos Scene Editor 3D is a scene editor for creating game with Ogre 3D. It's created with Purebasic.
Tactical Warfare Engine is an Open Source 2.5D Real-Time Strategy game engine made using OpenGL. It aims to be a replacement for the aging StarCraft game engine, but also supports the creation of entirely new RTS games.