CoreForth is a simple Forth for ARM Cortex M CPUs, based on Brad Rodriguez’ CamelForth and Richard WM Jones’ JonesForth. The source is located on Github.
CoreForth is superseeded by CoreForth SE, a faster subroutine threaded Forth.
A further evolution is CoreForth-0, which takes code and leanings from CoreForth SE, and which can be cross compiled using Janus to MSP430, ARM Cortex-M and p3216 targets.