This project aims to provide a tool to render maps just as the original games of various Command and Conquer games such as Red Alert 2, Yuri's Revenge, and later Tiberian Sun would. For now, Red Alert 2 and Yuri's Revenge maps are rendered quite well.
The Rollercoaster Tycoon 3 Object Importer allows you to produce custom objects for Rollercoaster Tycoon 3 including trees/plants, walls/floors/roofs, fences, lamps, stalls, special attractions, litter bins, benches, path extras and general scenery.
Theme Park Builder 3D - an ambitious community project to create a free amusement park construction game. You can build a huge park and then take a first person view and "ride the rides". Key features include user created content and expandability.