Depends on what are you interested in and if you prefer a particular programming language eg if you are good in say PHP I'd suggest helping the MantisBT project a bugtracker used by a lot projects. <a href="https://github.com/mantisbt">https://github.com/mantisbt</a>. or say Python and enjoy genealogy I'd suggest going for Gramps <a href="https://github.com/gramps-project/gramps">https://github.com/gramps-project/gramps</a> .<p>Maybe share more info on what you like so we suggest something you might enjoy?