This is the official Java client library for the Ipregistry IP geolocation and threat data API, allowing you to look up your own IP address or specified ones. Responses include more than 50 data points including location, currency, timezone, threat information, and more.
If you're reading this, I probably don't have to tell you about Freshmeat. This repository of open source code and projects has been around quite a while, and is used by a number of prominent projects. What you may not know, however, is that Freshmeat offers a well-designed Freshmeat API to help developers access the data on Freshmeat for any purpose that makes sense.
Google is pitching its Activity Recognition Transition API as the key to unlocking insight about smartphone owners' movements. The idea is to let developers decipher between simple movement, such as walking, and complex movement, such as driving all while maximizing battery life.