I like the idea of social bookmarking, but haven’t gone through the effort of comparing all the options yet. I do have a list of open source bookmarking projects though:

Federated social bookmarking:

• https://github.com/raffomania/linkblocks

• https://postmarks.glitch.me/

Social bookmarking:

• https://linkhut.org/

• https://linkding.link/

• https://grimoire.pro/

• https://apps.nextcloud.com/apps/bookmarks

• https://sitebar.org/

• https://semanticscuttle.sourceforge.net/

Apps:

• https://github.com/floccusaddon/floccus

• https://github.com/fibelatti/pinboard-kotlin

Bookmark manager:

• https://aerocyber.adityaajay.me/sitemarker

webpage archiving:

• https://wallabag.org/