* [[Arnor C]] ([[Arnor]]/[[WACCO]])
* [[Aztec C]] (Manx)* [[BDS C]](BD Software)* [[C/80]] (Software Toolworks)
* [[FIOLIB]] (not a C language per se, but the IO-LIB and environment for FutureOS)
* [[HiSoft C|Hisoft C]] ([[Hisoft]])
* [[Hi-Tech C compiler]]
* [[MI-C]] (Herbert Rose)
* [[Mix C Compiler]] (Mix Software)
* [[SDCC]]
* [[Small C]]
* [[Whitesmiths C]] (Whitesmiths, Ltd.)
* [[ZCC]] (Ken Yap)
* [[Z88DK]]