a modular, plugin-driven peer-to-peer client framework which is designed with true multi-network downloads in mind. It can be used directly via the built-in shell functionality, or via external user interfaces.
a Direct Connect clone, a windoz client allowing users to share their files and talk (like IRC but more software sharing oriented) using a proprietary protocol.
Large-Scale Open-Source Web Search YaCy is a scalable personal web crawler and web search engine. One YaCy installation can store more than 10 million documents, but in a community of search peers YaCy can provide a search index of unlimited size.
JADE (Java Agent DEvelopment Framework) is a software Framework fully implemented in Java language. It simplifies the implementation of multi-agent systems through a middle-ware that complies with the FIPA specifications and through a set of graphical tools that supports the debugging and deployment phases. The agent platform can be distributed across machines (which not even need to share the same OS) and the configuration can be controlled via a remote GUI.
a P2P filesharing client which is based on the Gnutella network. It offers advanced functions and integrates all common Gnutella extensions (the best Java Gnutella Client)