Kanvas, the app that allows users to add creative elements to videos, has announced SDK that will enable third party apps to utilize its feature set. The SDK is available to developers for free and offers everything from filters, GIFs, overlays, and much more. The SDK is available cross-platform.
If you wonder which of the 267 APIs on this site people view most often you might be surprised. It's not Google Maps, it's YouTube. Which has been true for quite some time. But the number of mashups using YouTube has been small, until recently when they've started to pick-up.