Bookmark It - Create awesome notes on YouTube videos
Usersnap - Visual Feedback - Usersnap helps your business with its versatile feedback platform to build better, more successful products and services with the help of user feedback. Collect feedback along your product development lifecycle. Try it for free.
PageMarker - Save, organize, annotate and revisit your bookmarks
Tweakr.io - The fastest way to get visual feedback 📌
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.