Apportable. Amazing tool that compiled Obj-C to Android targets, and had stubs to bridge iOS frameworks to Android. Sounds impossible but it actually worked, really well. They had limited support for UIKit, and it worked flawlessly with Cocos2d so was great for porting games. They were starting to integrate with SpriteBuilder, a nice open source scene editor for Cocos2d but once Apportable pulled their support that community disappeared overnight.<p>Pretty sure they got acquired by Google, who are taking engineering in a new direction with a new project named Flutter that uses Dart as the source language, which is totally useless for porting over existing Obj-C code bases. Too bad, so sad.