Annotate.tv - Optimize your learning on YouTube
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Prodeus - Track your time learning on YouTube to earn your free degree
Superdense - No text, just icons.
Slid - Capture knowledge from online videos, courses, and webinars
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.