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 a decentralized communication platform focused on privacy and file sharing, while Ring offers a simpler interface with end-to-end encryption and calling features. RetroShare is more suited for users needing extensive file sharing and privacy, whereas Ring appeals to those looking for straightforward communication.