I am a Software Developer from Germany ( Freiburg )
Freiburg Parkdata is a open data project. The data is from the open data Portal Freiburg City Link to the JSON
Your Logbook is a Django based Webproject. You can log your location with your GPS signal and add photos. Currently the site is only available in german language.
With Geekrush you can train you
mathematical skills in tree different
difficulties. As further you come the
quicker you have to answer the task.