Komga is described as 'free and open source comics/mangas server with a web-based interface for browsing, searching and reading books and series as well as for administering accounts and access' and is an app in the News & Books category. There are more than 10 alternatives to Komga for a variety of platforms, including Self-Hosted solutions, Windows, Linux, Mac and BSD. The best alternative is calibre, which is both free and Open Source. Other great apps like Komga are Calibre Web (Free, Open Source), Ubooquity (Free Personal), BookFusion (Free) and COPS (Free, Open Source).
Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
eBook platform focused on openness that provides e-book library management and reader for users to upload & read their e-books across all devices while also allowing businesses and schools to create their own digital library to distribute content.
COPS' main advantages are : * No need for many dependencies. * No need for a lot of CPU or RAM. * Not much code. * Search is available. * With Dropbox / Owncloud it's very easy to have an up to date OPDS content server.
BicBucStriim streams digital books - it provides web-based access to your e-book collection. BicBucStriim is a simple PHP application that reads the Calibre data and publishes it in HTML form and as OPDS book catalog.
Calibre2opds can generate OPDS and HTML catalogs from the metadata of the calibre e-book library manager. These catalogs can then be used both to browse your e-book library online and also to download books on demand.