Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.
GlobalComix - Professional Comics Publishing
Comixology Unlimited - Netflix for comics and graphics novels by Amazon
DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.
HalftonePro - Create custom vector halftones quickly and easily
MangaDojo - MangaDojo is a community for manga artists and readers from all around the globe!