Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Bigtent - BigTent is a web-based organization and communication portal for groups.
Skip Tunes - Control iTunes, Spotify, or Rdio from your Mac's menubar
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Plaaying - Share, control, and keep on Plaaying music on your Mac.