The Small Device C Compiler (SDCC), targeting 8-bit architectures
Binary executable decompiler
C compiler and dev kit for the z80 with assembly language libraries.
EMX compiler hosted on Win32
Open Watcom C/C++ compilers and tools Fork
Oberon family of languages to C translator for ARM, x64 and x86 archit
A minimalistic but complete standard Forth compiler in C
ATasm is a 6502 command-line cross-assembler.
Micro Programming Language - A Portable Language for Micro Computers
Homebrew toolchains for wii, gamecube, 3ds, ds, gba, gp32 and psp
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
Moved to https://github.com/davidgiven/ack
Embed C++ in Python source code, dynamically compile and access data
Translates Python to C#
High-level, meta-language, trans-compiler with virutal machine
Dual-target (32 & 64-bit) MinGW-W64 compilers for 32 & 64-bit Windows