GreenVulcano®ESB, The Open Source Enterprise Service Bus!
GreenVulcano® ESB is a platform for application integration, able to connect multiple heterogeneous systems. Its plug-in architecture allows for unlimited expansion and customization, providing the solution to many different business integration problems. GreenVulcano® brings flow-related concepts such as transformation and routing to the Service-Oriented Architecture.
Business Process Engine (BPE) is an implementation of Model-Driven Development approach. BPE let you to "draw" an algorithm (flow of actions) and test it in the same environment.
Solution is implemented in C# as a plug-in to Microsoft Visio tool.