Distributed communication app for encrypted calls, messages, video, and file sharing.
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Open source team chat platform for messaging, collaboration, and self-hosted communication.
Microsoft translation tool for text, speech, web pages, and multilingual communication.
Matrix-based secure messaging app for encrypted team chats, rooms, and federation.
Encrypted messenger built on decentralized routing for private chats without phone numbers.
Signal is a messaging application focused on privacy. Its source page describes end-to-end encryption via the open source Signal Protocol, and support for text, voice messages, photos, videos, GIFs, files, voice and video calls and group chats. It is described as free, with no ads or trackers, and as an independent nonprofit.
Telegram is described as a cloud-based mobile and desktop messaging app with a focus on security and speed. It offers apps for iPhone/iPad, Android, PC/Mac/Linux and macOS, and states that messages are heavily encrypted and can self-destruct.