Open alternatives5
Open-source apps that replace Amazon Kindle, Audible and more

Audiobookshelf is a self-hosted server for streaming your own audiobooks and podcasts. It is for people who want to run their own library and listen in a browser or on their phone.

KOReader is a free document reader for e-ink e-readers, Android devices and Linux computers that opens e-books, PDFs and comics. It is for people who want a customizable reading app on devices like Kindle, Kobo and PocketBook.

Calibre is a free program for organizing, reading, converting and editing e-books on your computer. It is for anyone who keeps a collection of e-books or uses an e-book reader device.
Open Library is a free, editable online catalog of books, aiming for a web page for every book ever published. It is for readers and anyone who wants to look up, add or correct book information.
Inventaire is a free web app for making lists and inventories of your books. It is aimed at people who want to track their own book collections and share them with others.
What's missing
What people still miss here, and wish existed. Upvote what matters to you.
Before you build
Planning something for e-books & audiobooks? See what exists first, so you can reuse parts or explain what's different. Paste this into any AI assistant:
Fix the list itself
A project or closed app missing from this list, or a mistake on it? These open a short form on GitHub, and a mod reviews it. To say what a project can't do, use What's missing.
About this page
Replaces fully means it does the main job of these apps; Replaces partly means it covers some of it.
Licenses: every project here uses an open-source license (what each one means). Open core means some parts are paid or under another license.
GitHub stars are shown for reference. They measure popularity, not whether it replaces anything.
Verified means r/TrueOpenSource mods checked it: open-source license, maintained, and it really does the job.
How Open Source Everything works