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
FilePizza focuses on decentralized file sharing with an easy-to-use interface, while RetroShare provides a more comprehensive solution integrating secure communication and file sharing. Both prioritize decentralization but cater to different user needs.