Sketch Repo - Collection of resources for anyone who uses Sketch
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
SketchApp.rocks - Index of all awesome things related to Sketch.
Sketch The Ripper - Rip and share .sketch files on any OS in one click 💎
Flow - Stop managing projects from your inbox.
Abstract - A secure, version-controlled hub for your design files