Multitask with ease. Helium is a floating browser window that allows you to watch media while you work. Your content will never fall behind your other windows even as you switch tasks.
Glaze is a floating browser built to view your favorite content right alongside your work! Glaze makes optimum use of the space available on your screen. Glaze can be put anywhere on your screen and give you the possibility to do multiple things at once.
FloatPlayer is a simple Mac app that plays a floating YouTube-video on your screen. The player is visible even on top of full-screen apps. It's also completely open source. Check it out on GitHub.