Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.
Tapas - Tapas – Comic, Novel and Stories is free to use digital comic application by Tapas Media that puts tens of thousands of comics and web novel on your mobile device.
GlobalComix - Professional Comics Publishing
Comic Cruncher - Visualize appearances per year of comic book characters 💥
Piperka - Webcomics listing and subscription manager
DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.