Robin Muilwijk

Thanks Ruth and Chiara, for suggesting Joomla! I can recommend this project myself, as former member. There is lot's to do like: coding, documentation, translation and more. It's a great way to step into an open source project, and learn.

If you are into mapping, check out Open Streetmap http://wiki.openstreetmap.org/wiki/Beginners'_guide You might be able to put your own neighborhood on the map.

Or maybe you are into science? Check out open science and open access at http://openscience.com/what-is-open-access-useful-links-for-beginners/

And if you want to work with something concrete, something solid like open hardware, this is fun: http://www.youtube.com/user/RaspberryPiBeginners.