Trello Bookmark - Store your bookmarks as Trello Cards
Bookmark It - Create awesome notes on YouTube videos
Bookmarked - Create, share, and browse curated bookmark collections.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
forlater.email - forlater is an email-based bookmarking service.
PageMarker - Save, organize, annotate and revisit your bookmarks