A virtual world engine writen by C# Provide network,serialization,thread management,work flow,cluster management,RPC etc.It's designed for concurrency. For performance, it doesn't use lock to resolve conflicts, otherwise it use queues.
Zen Worlds is an object oriented C++ virtual worlds / MMO game engine framework. This project includes Zen Engine game engine client, Zen Enterprise, an Enterprise Service Bus, and a C++ Application Server, and Zen Studio, a game development IDE.