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.
Pennywise is a multiplatform desktop application that allows you to open anything in a small floating window that always stays on top of the other applications all the time, allowing you to multitask with ease. No need to keep struggling with alt + tab, use pennywise and have your work in front of you all the time.
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.
Stratus is a simple web browser designed to make it easier to multitask while watching videos. It features a picture-in-picture (PiP) mode that will always stay on top of your other windows as well as a collection of magic plugins that optimizes video sites for watching.
Please report any issues at https://github.com/chrisg32/Stratus/issues.