Bookmark It - Create awesome notes on YouTube videos
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Video Search for YouTube - Search any YouTube video like a document.
PageMarker - Save, organize, annotate and revisit your bookmarks
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter