Bookwyrm - foss federated alternative to goodreads
Reading Length - How long will it take to read that book?
Inventaire - Keep an inventory of your books and of what can be done with them (Lending, Gifting, Selling). Share it with your friends and communities. Remember the books you lend or borrow.
Bookmarking
LinkWarden - Bookmark manager that backs up every page in multiple formats, including full HTML content, ensuring you always have access to the original content. It also allows annotation.
BookMarkIt - Bookmark, Categorize, and Favorite your websites.
Wallabag - Save and classify articles. Read them later. Freely.
Faved - self-hosted solution to store, categorize, and access your saved web content and links from anywhere.
Brace.to - helps you save links to everything and visit them later easily, anytime, on any of your devices.
Foliate - a beautifully crafted eBook reader. The developer has put a lot of effort in ensuring its easy to navigate around eBooks. Range of features with a distraction-free reading experience that lets the interface fade out of view to enable the reader can concentrate on reading.
KOreader - KOReader is a document viewer for E Ink devices. Supported fileformats include EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI and ZIP files. It’s available for Kindle, Kobo, PocketBook, Android and desktop Linux.
Hyperlegible Fonts - free, easy to read fonts from the Braille Institute
Liblouis [software] - The Liblouis software suite provides an open-source braille translator, back-translator and formatter for a large number of languages and braille codes.
Libreture - Your private cloud library. Store your ebooks, track your reading, and discover new bookshops. Upload all your DRM-free epub, mobi, azw3, PDF, CBZ and CBR books to build your private library. Track what you've read, what you're reading and what you want to read. Explore readers' libraries and recommendations to discover new ebooks and DRM-free bookshops.
OpenLibrary - Millions of ebooks and audiobooks available to borrow through controlled digital lending. The ultimate goal of the Open Library is to make all the published works of humankind available to everyone in the world.
Standard Ebooks - a volunteer-driven effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks. Standard Ebooks takes ebooks from sources like Project Gutenberg, formats and typesets them using a carefully designed and professional-grade style manual, fully proofreads and corrects them, and then builds them to create a new edition that takes advantage of state-of-the-art ereader and browser technology.
Librivox.org - Free public domain audiobooks read by volunteers from around the world.
Gutenberg.org - Project Gutenberg is a library of over 75,000 free eBooks