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 primarily focused on privacy and secure communication, while Vuze emphasizes multimedia sharing and community features. RetroShare offers decentralized networking, whereas Vuze uses the BitTorrent protocol for file sharing.