I work mostly with Swift/Objective-C and I open source a lot, including a video social network built with Ruby on Rails. I also dabble in Photoshop / Sketch. I am a Mechanical Engineer by training.
- Swift cheat sheet: https://github.com/iwasrobbed/Swift-CheatSheet
- ObjC cheat sheet: https://github.com/iwasrobbed/Objective-C-CheatSheet