Shaarli

 Shaarli  is a simple web program you can install to store and share your bookmarks. It has been designed to be lightweight and easy-to-use.

It is primarily a bookmarking application, but the feature list indicates you can also ". . . use it for micro-blogging (like Twitter), a pastebin, an online notepad, a snippet repository, etc."


 * Github: https://github.com/shaarli/Shaarli
 * Documentation: https://shaarli.readthedocs.io/

IndieWeb community members who are using it on their own site:
 * Johannes Ernst is using it since he moved from delicious.com, and he's not looking back!
 * Élie Michel uses it too.

Webmentions
Adding a bookmark in Shaarli has it send a webmention to the target URL.

Actually, this function has not been merged to the master branch yet but is available in that fork.