The Small Device C Compiler (SDCC), targeting 8-bit architectures
A complete runtime environment for gcc
Linux to DJGPP cross-compiler with pthread library and std::thread.
BASIC Compiler and Interpreter
CI maintained precompiled GCC ARM/ARM64 Toolchains for Raspberry Pi
EMX compiler hosted on Win32
Implementations for the Revised Report language
Mariko's GCC for the x68000
Cygwin cross-compiler for Fedora
Ada cross compiler and libraries for AVR µCs
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)
Build System for FLDIGI Applications
High-level, meta-language, trans-compiler with virutal machine
Ada compiler support for TI MSP430 processors