ciforth
Originally started as a Forth implementation for Intel microprocessors, It now comprises ISO-Forths in fig-Forth tradition (one assembler source file) for quite some targets. Targets are 16,32 and 64 bit Intel on MS-DOS, MS-windows and Linux, and as stand-alone. Non-Intel targets include the Motorola 6809, and the Renesas M16C (embedded) and the DEC Alpha (Linux).