Memex is a news and books app and website that allows users to store, share, and organize their favorite articles, books, and other content. It also provides personalized recommendations tailored to users’ interests. With Memex, users can easily access their favorite content from any device, anytime. Users can also save articles and books from any website, as well as highlight and annotate their favorite passages. They can also share their favorite content with other users and join discussion groups about topics of interest. Memex also offers a variety of tools to help users discover new books and articles, as well as track their reading progress. In addition, users can even use Memex to create their own personal library and keep track of the books they own.
Pocket
Raindrop.io
wallabag
Diigo
Pinboard
Google Bookmarks
Hypothes.is
Polar
Weava
Brancher
Snippet
It is not very similar, but it is one of the first of its kind.