The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.
Crafty is a 3D object, material, model and file browsing utility.
Crafty is a 3D object, material, model and file browsing utility targeted towards Half-Life modders or enthusiasts looking for a Steam Independent application for quick previews. It currently supports Half-Life 2 .bsp, .mdl, .vmf and .gl formats along with Half-Life .bsp, .mdl, .map and .rmf formats in a variety of render modes.