C compiler and dev kit for the z80 with assembly language libraries.
The GNU Prolog native compiler
amforth is an extendible interpreter on microcontrollers
Software build-automation tool written in Common Lisp
A "Just Enough Language" compiler targeting the 6502/Z80/6809
Your language to speak with all.
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
A multi purpose scripting language
High-level, meta-language, trans-compiler with virutal machine
*** Moved to http://github.com/esumii/min-caml ***
Assembler language for modern times