Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Annotate.tv - Optimize your learning on YouTube
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.
SkillTube - A curated list of best courses from YouTube & other platform