If you're a java programmer, and would like to contribute Fixes, Reports, Contents, etc.. they simply do a Pull request, or report the issue of how it's done. When Commiting work do your best to document and have clean and effecient code to work with for everyone else.
Elvarg is a #317 protocol RSPS. Server was written from scratch cleanly. With perfect combat, etc.. Good base to start off with.
Users will have opportunity to contribute to the GitHub Repository for any general fixes, and content additions, etc.. To better improve the base.