Jaymod is a server side mod that adds additional features into the game.
"Both branches include a security fix to address a client-side command weakness which can harm servers. Highlights for experimental release 2.1.2 include:
Omni-bot 0.61 support
Compass enhancements and transparency fixes
A new fully oriented (3-axis) hitmode
Fixed bug where new landmines would jitter
Restored !listplayers to old style, added !lsplayers
Extra correctness for fair-rifles mode
Comprehensive documentation on server configuration
Many other features and bugfixes are also included. For a more complete list, please refer to the bundled PDF file or online browseable documentation."