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.
Syntax highlighting for various VDF sub-formats. Response rules, materials, QC, SMD, FGD, soundscripts, actbusy, soundscapes, VBSP and weapon scripts are supported.
thanks very much indeed for these.