Piperka - Webcomics listing and subscription manager
Marvel (Comics) API - Create awesome stuff with the world's greatest comic API
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.
DC Universe - The DC Comics streaming service w/ original content
MangaDojo - MangaDojo is a community for manga artists and readers from all around the globe!
Comixology Unlimited - Netflix for comics and graphics novels by Amazon