Unfortunate, but long overdue. I move to Bookmark OS and have been very happy. It works in the browser so it is cross-platform including mobile https://bookmarkos.com
And I have to agree, Bookmark OS was the winner. It's not free, but it's only $12 / year. (XMarks being free was probably not good for anyone in the end.)
* XMarks Alternatives and Similar Software - AlternativeTo.net || https://alternativeto.net/software/xmarks/
So... Bookmark OS, Everysync, xBrowserSync.
And I have to agree, Bookmark OS was the winner. It's not free, but it's only $12 / year. (XMarks being free was probably not good for anyone in the end.)
* Bookmark OS | bookmark manager and organizer || https://bookmarkos.com/