Delta Chat
Exchange encrypted messages through decentralized email-based infrastructure.
Delta Chat is a cross-platform messenger with multi-device support and web apps shared inside chats. It can use chatmail infrastructure or compatible email servers rather than requiring one central messaging service.
Its shared chatmail core is written in Rust and implements networking, message handling, and end-to-end encryption for the Android, iOS, and desktop clients. Those clients have separate interfaces and language bindings; this listing links to the MPL-2.0-licensed Rust core, not a wholly Rust user interface.
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