Gforth

Gforth is a free and portable implementation of the Forth programming language, begun by Bernd Paysan and Anton Ertl in mid 1992 and distributed as free software under the GNU General Public License version 3 as part of the GNU Project. It runs as an interpreter for Forth across Unix like systems, Microsoft Windows and other operating systems, and it descends from earlier Forth implementations, including bigFORTH and fig-Forth, whose code and ideas it built upon. A primary objective of the project is strict adherence to the ANS Forth standard, and Gforth is described as fully compliant with that standard. Because Forth itself is a stack based, extensible language widely used for embedded systems, bootloaders and low level tools, Gforth's portability and standard compliance have made it a common choice for running and developing Forth code on ordinary desktop and server operating systems rather than only on dedicated hardware.