From this page, you can download a binary image of PropellerForth, suitable for transfer directly to the Parallax Propeller chip using the Propeller Tool.
If you'd like to get your hands dirty, or see how PropellerForth works, please download the PropellerForth source code.
PropellerForth is distributed under the terms of the GNU General Public License, version 2. A copy of it is included in the ZIP files below.