Komga, free self-hosted library server software, is officially supported: a public demo comes connected out of the box, with support for pointing at your own server coming soon. Beyond that, this official repository adds public-domain and openly licensed reading you can install straight away.
Add it under Settings, then Advanced, then Extensions. Full instructions.
70,000+ public-domain books from Project Gutenberg's own catalog API. Browse, search, genre filtering, and full in-app reading, split into real chapters where the text supports it.
Connects to Komga's own official public demo server (demo.komga.org) using the read-mostly credentials Komga itself publishes. Komga is free, open-source, self-hosted server software for a comic/manga library you already own; this bundled copy exists to show what a self-hosted library looks like in Boundless without any setup.
Beyond Komga and the official repository, Boundless can install extensions from any other repository
you point it at. This is an advanced feature, and these repositories are not officially
maintained by Boundless. A repository is a plain HTTPS location serving a
versioning.json listing and one folder per source.
A repository you add is code that runs on your device and makes network requests on your behalf. Add repositories you trust, the same way you would with any other software. Boundless does not review, endorse, or host third-party repositories, and the extension source for anything you install can always be read before you install it. If something goes wrong in the app because of a third-party repository, we cannot support or troubleshoot it. Contact whoever maintains that repository directly.