BinaryJS is a lightweight framework that utilizes websockets to send, stream, and pipe binary data bidirectionally between browser javascript and Node.js.
scribe - Scribe is a server for aggregating log data streamed in real time from a large number of servers. It is designed to be scalable, extensible without client-side modification, and robust to failure of the network or any specific machine.
Flumotion is a streaming media server created with the backing of Fluendo. It features intuitive graphical administration tools, making the task of setting up and manipulating audio and video streams easy for even novice system administrators. Flumotion is released under the GPL.