The Chartboost iOS Sample Code by Chartboost demonstrates how to integrate charts into game monetization applications. It includes an SDK with Chartboost initialization, rewarding video ad, and integration testing.
Shoudio is an amusing iOS application made to tag places with audio snippets. These can be anything a user imagines, and a lot of fun could be had with this. For example, integrating this into Geocaching could be a lot of fun, allowing things like audio hints to help Geocachers find the cache. However, the developers of Shoudio didn't want it limited to just one platform, so they released a Shoudio API to allow clients for other platforms, and fun mashups.