VIZ Manga - VIZ Manga is a multi-platform app that serves as an excellent resource for fulfilling the needs of comic lovers.
Marvel (Comics) API - Create awesome stuff with the world's greatest comic API
Izneo - Izneo, Read Manga, Comics and BD is a leading all-in-one digital manga and comic application that allows you to read unlimited comics even offline.
DC Universe - The DC Comics streaming service w/ original content
Manga Storm CBR - Manga Storm CBR is the best-in-class app for accessing and reading DRM-Free comics in formats like PDF/CBR/CBZ on the iPad/iPhone.
Comixology Unlimited - Netflix for comics and graphics novels by Amazon