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
Off-the-Record Messaging focuses on providing secure, ephemeral instant messaging with strong anonymity, while Bitmessage emphasizes decentralized, encrypted communication suitable for both public and private messaging. Both prioritize security, but Off-the-Record is more user-friendly for instant messaging, whereas Bitmessage offers a broader range of decentralized communication features.