Who needs a tracking service when you can just hop on the USPS, FedEx, UPS, or DHL website (or whoever your carrier is) and just track? Maybe you. The Trackthis API integrates an amazing array of functions into your application. The API webpage lists over 10 carriers you can get notifications for.
Trailforks runs "a user-powered mountain bike trail database currently focused on BC, Canada," to report on trail conditions and what is required to upgrade them.Notes for the Trailforks API are like the bike trails it reports on: rough. But the site's creator, Trevor May, promises more documentation soon.