DJGPP
Game Programming, Libraries, Web Rings, Cprogramming.com - DJGPP, DFE95 -- The DJGPP Front-End for Windows 95, DJGPP, DJGPP and Related Links, DJGPP FAQ, DJGPP Public Access Cross-Compiler, DJGPP Resource Center, DJGPP Software Packages, RHIDE, Where to find DJGPP packages
Mix Software Inc
Makers of Power C for DOS, Win32, and Linux. C++ addons, but no compiler.
Pacific C
Freeware C compiler for DOS from HI-TECH software.