Liberator Free Edition
Liberator is the most performant and fully-featured server currently available for streaming real-time data to web pages. The technology behind many of the world’s leading financial trading portals, it is now available FREE for evaluation and non-commercial use.
Liberator Free Edition comes with a comprehensive client library for integrating with Ajax or Flex RIAs, a Java server library for connecting to sources of data and building application logic, and full documentation.
Liberator is written in C and runs on Linux, or on Windows using VMware.
Download: Liberator Free Edition