Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
BookmarkSheet - Your bookmarks in Google Sheets
SkyBucket - Save and manage all your bookmarks on one board
Siimpl Bookmarking - Start collecting and organizing what interests you
Marqly - Easy-to-use, Marqly lets you save, customize and manage all your bookmarks and texts online like a breeze.
Annotate.tv - Optimize your learning on YouTube