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 focused on privacy and decentralization for secure peer-to-peer communication, while BitTorrent is more about speed and efficiency in file sharing. RetroShare is ideal for users prioritizing security, whereas BitTorrent is suitable for those seeking a widely-used platform for quick downloads.