A Java library that simplifies thread development. It has support for continuations, fork/merge, signals, thread and process serialization, event picker (similar to BPEL's pick element), among other features.
Sfeb is a Simple and Flexible Enterprise Bus. Its purpose is to share business components on a network, and make them accessible through various protocols(http, jms, ...). Sfeb can be adapted, to your needs with the Sfeb sdk.
PeerVibes is a framework for creating applications based on peer-to-peer networks. This framework provides the necessary tools and architecture to build complex applications such as collaborative work support and distributed backup.
A Simple Open Source Monitor and Manager for Tomcat's Web Applications.
SiMonCat allows deploying and undeploying of web applications, and monitoring the state of multiple tomcat servers, through the attempt to execute programmed events.
Web Objects in XML (Framework) is an interoperable and lightweight system for distributed objects. It is currently built in Java and C#. Remote objects are serialized in a standard XML format, and they are accessible trough their own URL.