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
eMule is primarily a file-sharing tool with a larger user base and a focus on community support, while RetroShare emphasizes privacy and decentralization, making it suitable for users prioritizing anonymity and security.