From OpenStreetMap Wiki
Here are a few things I made for OpenStreetMap (or take a look at my github profile):
node density visualization
I've visualized OpenStreetMap's node density. read more
quality assurance feeds generator
more misc stuff
- a mod of the "browse latest changes on OpenStreetMap" tool by tmcw and lxbarth that filters to the changes of last week.
- osmtogeojson, an OSM-to-GeoJSON converter