Open source calibre projects
Every project in the registry tagged calibre, ranked by real GitHub adoption.
The official source code repository for the calibre ebook manager
Readest is a modern, feature-rich ebook reader designed for avid readers offering seamless cross-platform access, powerful tools, and an intuitive interface to
:books: Web app for browsing, reading and downloading eBooks stored in a Calibre database
Calibre-Web but Automated and with tons of New Features! Fully automate and simplify your eBook set up!
Manage your ebook library without frustrations. Calibre compatible.
A command-line tool for Z-Library. Search, download, send to Kindle, and integrate with AI agents.
Related tags
Frequently asked questions
How many open source calibre projects are there?
This registry tracks 6 projects tagged calibre, with 79,833 GitHub stars between them. The most-adopted is calibre at 26,327 stars.
Are these calibre projects free to use?
Yes — 6 of the 6 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which calibre project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these calibre projects still maintained?
6 of the 6 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.