An Instagram client for Windows phone. It cannot upload photos to Instagram (yet), but it can sort and save photos from an Instagram account to a photo library, and it has a neat UI.
Ask Quora questions and it will find you the answer. It is voice-enabled, and users can answer other people's questions as well. Now available for Android.
(Credit Blue Lotus)
8Bit Beatbox — iPhone Edition
Platform: iOS (iPhone)
For a bit of geek fun, 8Bit Beatbox is loaded with low-fi 8-bit retro video game-style samples for you to have fun with. Features an 8-channel percussion tracker and a virtual keyboard.