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
Bitmessage is primarily focused on secure and anonymous messaging, making it ideal for privacy-conscious users. In contrast, RetroShare offers a broader range of features, including file sharing and a more user-friendly interface, catering to those who want an all-in-one decentralized communication platform.