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
Pidgin-Encryption is a versatile messaging client that requires plugins for encryption, making it more complex but highly customizable. In contrast, Bitmessage is a decentralized, anonymous messaging system focused on security and privacy, but it may be less user-friendly and slower.