Red5chat is an opensource project of a video chat written in Action script AS2 (flash7) using the RED5 flash server. It allows private/public chat with audio and video through an Flash interface
XMLSocketd is a server written in C++ to be used with the ActionScript class XMLSocket for communication between Flashmovies.
Can be used for chats, whiteboards, etc in conjunction with any serverside script like PHP for authentication and room handling