Pressbooks - Create books: print and ebooks
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.
Time Capsule - Transform your 2020 into a tiny, personalized book for free!
GlobalComix - Professional Comics Publishing
Papermine - Create stunning digital booklets.
Comixology Unlimited - Netflix for comics and graphics novels by Amazon