The MUSCLE system is a fast, portable, flexible client-server system for distributed applications. Clients send BMessage-like PortableMessages to each other either directly or via a centralized server (with built-in database and 'live query' support).
OpenCDN aims to hierarchically chain a set of Streaming Servers, for deliver of Live Streaming contents to millions of viewers. Development is based on the Apple Darwin Streaming Server (DSS) and Linux, but porting to (Helix, WM) is possible.
A distributed, peer-to-peer, server-less communication & messaging solution for JAVA (JMS), C++ and .NET applications, integrates with JBoss, WebLogic & WebSphere. Offers guaranteed delivery, security and transactions. Supports TCP, SSL & HTTP protocols.