Simple C compiler
Action! - The Native Programming Language for Atari 8-bit Computers
C compiler and dev kit for the z80 with assembly language libraries.
amforth is an extendible interpreter on microcontrollers
Simple ⇒ Object-Oriented ⇒ Functional
A "Just Enough Language" compiler targeting the 6502/Z80/6809
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
A multi purpose scripting language
*** Moved to http://github.com/esumii/min-caml ***
Assembler language for modern times