I support the idea Open-Source and would encourage everyone to do so as well. Things I've worked/I'm working on include:
2FactorAuth: A great collection of sites, using 2-Factor-Authentication for enhanced security - 2fa.directory (on GitHub)
MapSwipe: This mobile app easily allows users to support the Humanitarian OSM Team by presenting you with easy tasks (e.g. identifying building and roads). The data flows into the Tasking Manager. This supports Humanitarian organizations to get better maps for faster response in a crisis. - mapswipe.org (on GitHub)
Other things I do
See links to stuff I do in the right-hand table; and here: