If anyone wants to do some open source work you can consider these plugins for Q2A and release them on github or as paid plugins. Only base PHP skill is required. GO and many other sites are running on Q2A.
http://www.question2answer.org/qa/57345/request-important-addons-modules-plugins-available-separetly
Current ones which can be used for reference:
http://docs.question2answer.org/addons/