Bookmark It - Create awesome notes on YouTube videos
CloudApp - CloudApp allows you to share images, links, music, videos and files. Here is how it works: choose a file, drag it to the menubar and let us take care of the rest.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Anno by Modfy - Collaboratively annotate any video/audios files, from feedback on songs to detailed product feedback and much more.
Video Search for YouTube - Search any YouTube video like a document.
TAGX - Create/share video highlights and annotations