Mopidy is an extensible music server written in Python.

Mopidy plays music from local disk, Spotify, SoundCloud, Google Play Music, and more. You edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.

Tornado is an open source [python] version of the scalable, non-blocking web server and tools that power FriendFeed.

Openfire is a real time collaboration (RTC) server licensed under the Open Source GPL. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance.

I'm using x|encon (http://www.xencon.net/) for my Django hosting. Might add that in the future.

I tool similar to monit (comparison anyone?): supervise and check running processes.

...our price is based solely on your actual usage...