The Small Device C Compiler (SDCC), targeting 8-bit architectures
BASIC Compiler and Interpreter
Linux to DJGPP cross-compiler with pthread library and std::thread.
CI maintained precompiled GCC ARM/ARM64 Toolchains for Raspberry Pi
C compiler and dev kit for the z80 with assembly language libraries.
SUNY Stony Brook Pascal for the IBM/360 written in XPL
A GCC cross-compiler targeting FreeBSD
A GCC cross-compiler targeting Linux musl
A GCC cross-compiler targeting NetBSD
A GCC cross-compiler targeting DragonFly BSD
A GCC cross-compiler targeting Android
A GCC cross-compiler targeting Haiku
A GCC cross-compiler targeting SerenityOS
A GCC cross-compiler targeting OpenBSD
PEARL Compiler and Runtime System
Implementations for the Revised Report language
Oberon family of languages to C translator for ARM, x64 and x86 archit
A minimalistic but complete standard Forth compiler in C
Cygwin cross-compiler for Fedora
Ada cross compiler and libraries for AVR µCs
An open source ecosystem for IoT development
A "Just Enough Language" compiler targeting the 6502/Z80/6809
Micro Programming Language - A Portable Language for Micro Computers