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 focuses more on decentralized communication and privacy, while Tribler is designed for efficient file sharing and includes built-in anonymity features. Both applications prioritize user privacy but cater to different user needs and preferences.