I have very fond memories of Quake C. It was a bit more like pascal in some ways than C but the compiler came with quake (the first one with the NIN soundtrack). It had the source for the existing bits of the game that were written in it, which was all the behaviours, and you could change it and recompile to a new dll. It was easy to use and quite performant.
I'm definitely remembering quake1 but I might be wrong about the dll? I remember doing very poor version control copying the dlls into and out of the main folder.
