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
Piperka - Webcomics listing and subscription manager
Impressed Photo Books - Create a photo book in minutes. Starting at $22.
webcomic.app - Create a website for your webcomic.