RetroShare is open source software for encrypted filesharing, serverless email, instant messaging, online chat, and BBS, based on a friend-to-friend network built on GNU Privacy Guard (GPG). Developed by DrBob
License: Open Source
RetroShare is a decentralized platform focused on privacy and community building, offering robust P2P features for file sharing and communication. In contrast, Echoplexus emphasizes social networking and content discovery, providing tools for event management and user engagement but lacks the strong privacy features of RetroShare.