Bandcamp - Discover amazing music and directly support the artists who make it.
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
SoundCloud - Enjoy music & follow favourite artists
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
JSter - JSter is a community-driven catalog of the most useful javascript libraries.