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.
comiXology – Comics & Manga - comiXology is a handy Comics & Manga app for iOS that enables you to browse more than hundreds of thousands of manga, digital comics, and graphic novels from popular publishers such as Image, Marvel, and DC.
GlobalComix - Professional Comics Publishing
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
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.