The Small Device C Compiler (SDCC), targeting 8-bit architectures
SUNY Stony Brook Pascal for the IBM/360 written in XPL
A minimalistic but complete standard Forth compiler in C
Linux to DJGPP cross-compiler with pthread library and std::thread.
C compiler and dev kit for the z80 with assembly language libraries.
CI maintained precompiled GCC ARM/ARM64 Toolchains for Raspberry Pi
PEARL Compiler and Runtime System
multi-platform cross assembler for 6502/6510/65816 cpu
BASIC Compiler and Interpreter
Implementations for the Revised Report language
Oberon family of languages to C translator for ARM, x64 and x86 archit
ATasm is a 6502 command-line cross-assembler.
Cygwin cross-compiler for Fedora
Ada cross compiler and libraries for AVR µCs
A "Just Enough Language" compiler targeting the 6502/Z80/6809
Micro Programming Language - A Portable Language for Micro Computers
Homebrew toolchains for wii, gamecube, 3ds, ds, gba, gp32 and psp
Supports writing Ada software for Cortex-M3, M4F boards
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
Moved to https://github.com/davidgiven/ack
Build System for FLDIGI Applications