Papermine - Create stunning digital booklets.
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.
Pressbooks - Create books: print and ebooks
GlobalComix - Professional Comics Publishing
Impressed Photo Books - Create a photo book in minutes. Starting at $22.
Comixology Unlimited - Netflix for comics and graphics novels by Amazon