Sketch Tricks - Articles for Sketch
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
The Good Workshop - TGW helps experts plan, run, and track UX, CX, Product and innovation workshops, fully automated and straightforward user experience.
Zeplin - Collaboration app for UI designers & frontend developers
Git Sketch Plugin - Version control for designers
Sketch Repo - Collection of resources for anyone who uses Sketch