Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Bookmark It - Create awesome notes on YouTube videos
Abstract - A secure, version-controlled hub for your design files
Sidenote - Timestamped notes on YouTube videos
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Video Search for YouTube - Search any YouTube video like a document.