PForth

pForth (Portable Forth) is a portable implementation of the Forth programming language written in ANSI C. It differs from the other distributions of Forth in that it strives for portability over performance.

The pForth implementation of Forth is an open source programming language.

History
PForth started out as HForth, which was used in connection with the Hierarchical Music Specification Language, a music experimentation language developed by Phil Burk, Larry Polansky and David Rosenboom. Phil Burk ported the HForth kernel to C when he moved to the 3DO company. The newly ported Forth at 3DO had to run on many different systems including SUN, SGI, Macintosh, PC, Amiga, the 3DO ARM based Opera system, and the 3DO PowerPC based M2 system.

License
Originally pForth was released to the public domain with a custom release and disclaimer of no warranty but in 2020, it was relicensed under the zero-clause BSD license, which is a public-domain-equivalent license.