Sketch Isometric Plugin - Generate isometric views from artboards and rectangles
Easle - Discover and hire hand-picked independent artists
PatternPad - Create beautiful geometric patterns
UnitedMasters - Creator tools for artists to get smart, get fans, get paid
Isometric Game Art Pack - Extensive library of game art for indie devs
Upwork - Forget the old rules. You can have the best people. Right now. Right here.