Bitmessage is a decentralized, encrypted, peer-to-peer, trustless communications protocol that can be used by one person to send encrypted messages to another person, or to multiple subscribers.
License: Open Source
Torchat is a Tor-based instant messaging client focused on user-friendly features and file sharing, but it has limited platform support and lacks group messaging. In contrast, Bitmessage is a decentralized messaging protocol that emphasizes security and privacy, offering features like group messaging and broadcasting, albeit with a more complex interface.