FilmHope - A/B test YouTube titles & thumbnails
TubeChop - TubeChop allows you to easily chop a funny or interesting section from any YouTube video and share it.
Vibby - Create + share highlights from any video in seconds
YT Cutter - YT Cutter is a free-to-use online tool that is making your life easy in cutting the videos to any length with high quality.
The YouTube Thumbnail Game - Guess which YouTube video thumbnail has more views
Typito YouTube Cutter - Typito YouTube Cutter is an intelligent free to use software that has been doing the tricks for you in making long videos into short clips via using editing tools.