Sketch Isometric Plugin - Generate isometric views from artboards and rectangles
Isometric Game Art Pack - Extensive library of game art for indie devs
MagicPattern - The best design toolbox with 10+ tools for anyone
Sketch This - Daily drawing challenges
Indie Boost - A video game discovery software used by Publishers, Press, YouTubers, and Streamers.
IsometricSass - Make isometric 2D objects without Javascript