Oh man, I'm not sure how I forgot to mention Sketch, it was part of the reason I got started. I've never used Photoshop to design interfaces and hope I never will :)

Designing - Sketch Prototyping/Presenting - Marvel and Invision Assets etc for devs - Zeplin (https://zeplin.io) Icons - Picons and Streamline Photography - DollarPhotoClub