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 offers a more privacy-focused and decentralized approach to file sharing with strong anonymity features, while aMule provides a more user-friendly experience with broader community support and faster setup options.