Ever wanted to use a Wii Remote, pheraps a Multitouch surface or the Microsoft Kinect to control your application/game even if web based? If so, then MonoMIG (Multi Input Gateway) is what you are looking for!
warpFX is a data abstraction library for Flex™ offering transparent data services between Flex™ and any AMF3 compatible server supporting some defined remote methods. warpFX ships with a server-side remote methods and AMF3 implementation for Helma.
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