Two days, a room full of hackers and one theme: music. This is the premise behind the Stockholm Music Hack Day, which resulted in 31 projects including hardware hacks, mobile, web and desktop applications. A number of the web applications are live and available for anyone to use.
Crowd.fm is an easy-to-use platform created to promote events online. It's been described by its founder Tekin Suleyman as "an amazing platform for getting events listed with a single click." The company provides the Crowd.fm API to provide developers integration options.