Been long time using open source and get benefit from it. I think it’s not fair if we don’t share something back. Be it a documentation, bug report, feature suggestion, of even a tutorial will do it. I myself have programming background, so I sometimes submit a patch to some project, sometimes a bug report and feature suggestion, sometimes a tutorial (like some stuff you found on this blog). This page, however, will list some of open source project I initiate.
Here’s the project I created: