Luis Rivera ported the document source to texinfo and generated an indexed pdf. You can download them from here
- Gema man page, including a tutorial introduction
and a brief reference summary
- Gema User's reference manual with a detailed specification
- GeL documentation with usage examples
- Building Gema, a detailed description on how to build
Gema (and GeL) on different platforms.
- "Why I love Gema", an article from David