RED5

In response to market pressures and lots of feedback from the developer community, Adobe has broken FMS3 up into three different editions
Flash Media Interactive Server (FMIS) - 4500 USD
Flash Media Streaming Server (FMSS) - 999 USD
Flash Media Development Server (FMDS) - FREE

Compare editions of Flash Media Server 3 - Flash Media Interactive Server, Flash Media Streaming Server and Flash Media Development Server. It offers dramatically improved performance, more secure streaming, live streaming enhancements, industry-standard H.264 and HE-AAC support, and streaming delivery to mobile phones with Flash Lite 3 and Adobe Media Player.