Lightstreamer is a scalable and reliable Server for pushing live data to Rich Internet Applications

Based on the AJAX-Comet paradigm, it streams real-time data to any Web browser, without installing anything on the client. Both HTML and Flex applications can receive live data from Lightstreamer, as well as traditional thick clients. See below for a quick example.

Lightstreamer has been used in many mission-critical production systems, where scalability, low network impact, bandwidth management, adaptive streaming, and other advanced features, have proven fundamental.

Homepage: http://www.lightstreamer.com/
Demo: http://www.lightstreamer.com/demos.htm
Download: http://www.lightstreamer.com/download.htm