Youtube controller consists of Google Chrome extension and Windows application, wich lets you to control player on youtube.com directly from Windows (even Play/Pause through clicking on app tray icon).
I created this simply for listening music playlists on youtube and easy controlling player over windows tray. It was very uncomfortable to find chrome and the youtube tab when i wanted to pause or resume song.
The extension is available here: Chrome Web Store
The windows app installer is here: Releases