Some useful links:
- A set of documentaion files in /docs/, particularly:
- readme.en.md - Overview
- intro.en.md - SP-Forth specifics
- The documentation online at https://spf.sourceforge.net/
- Some additional hints in Wiki
- The sources in UTF-8 encoding in the repository spf4-utf8 (since some files in the spf repository are shown incorrectly via the GitHub online viewer)