Five is currently undergoing major efforts to prepare a stable 1.0 release. Check the issue list if you're interested in helping out!
Five allows you to access your entire home music library from your Android powered phone. The system is currently functional, with active development preparing for a full-featured beta release soon.
If you're excited by this idea, please contact any of the team members to help out!
How it works
Background synchronization is used to deliver meta information about remotely stored music files so the user experience implies local data, even when streaming would be necessary. This includes artist and album associations, artwork, track listings, etc. When the user engages the music player, they are presented with a list of familiar content without utilizing network resources. Only when attempting to play a track (that is not in cache) does the system resort to the network for streaming.
Project Status
Alpha quality. There are numerous known bugs. The rewritten server currently lacks some user-friendliness basics like UPnP support and smooth desktop integration (like autostart options). The music player itself is missing robust playlist management, but is otherwise extremely capable.
Screenshots
Server setup on Linux:
Android client:
If you're curious about some of the music shown in these screenshots, check out my last.fm profile page to see more of what I like.