Red5 is an Open Source Flash Server written in Java. Here’s a collection of links into the Red5 site:
Main:
osflash.org/red5
Download:
www.osflash.org/red5/red5downloads
Installation requires Ant 1.6.2 and JDK 1.5 or higher. I installed mine in ~/Library/Red5 (OS X). Run Red5.app and open ~/Library/Red5/swf/DEV_Deploy/index.html in your web browser to try the demos.
Places to start:
Review the FAQ and *.txt files in the installation directory
Help: osflash.org/red5/help
Tutorials: osflash.org/tutorials
API: dl.fancycode.com/red5/api/
Wiki: jira.red5.org/confluence/dashboard.action