Greasy Fork is available in English.
To keep track of bookmarks. Automatically adds on the current date and most recent chapter of the fic you are reading into the bookmark notes. Used for keeping track of when you last read a fic, and what chapter you were on.
This was super useful! I was able to modify it for my bookmark system to get the title, author, work ID, and summary automatically added to my bookmark notes! I uploaded my own script, which you can see here: https://greasyfork.org/en/scripts/458631-ao3-bookmark-maker-adds-title-author-workid-summary-to-bookmark-notes-automatically