The shared (free!) YouTube and SoundCloud radio
Being built around the YouTube and SoundCloud API it enables the creation of collaborative and shared live playlists, with billions of videos and songs to choose from, all for free and without registration!
You can instantly create a playlist without logging in, and add your favourite music or playlists. Then the list is ready for collaboration with friends and listen to the music both of you like, in a organized manner. More Info »
To expand the listening pleasure, both the android app and website provides a custom chromecast receiver and casting page.
The team consists of Kasper Rynning-Tønnesen and Nicolas Almagro Tonne, and the project has been worked on since late 2014. More about the project itself can be found on GitHub