Cryptocat is described as 'Chat with your friends, securely. Cryptocat is free software with a simple mission: everyone should be able to chat with their friends in privacy' and is a popular Encrypted Chat app in the social & communications category. There are more than 25 alternatives to Cryptocat for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Cryptocat alternative is Signal, which is both free and Open Source. Other great apps like Cryptocat are Element, Matrix, Tox and Wire.
An open-source messaging app emphasizing privacy with encrypted communication. Share texts, calls, photos, and videos without ads or trackers, available across major platforms. Developed by Signal Technology Foundation and praised globally for security measures.
Provides secure collaboration with end-to-end encryption, supporting chat, voice, and video calls. Available on all major platforms, it enables digital sovereignty with a decentralized design and interoperability through bridges to systems like Slack and Teams. Includes enterprise-grade SaaS.
Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control.
With the rise of widespread government monitoring programs, Tox is an easy to use application that allows you to connect with friends and loved ones without anyone else listening in.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.
Threema is a new mobile messaging app that puts security first. With true end-to-end encryption, you can rest assured that only you and the intended recipient can read your messages.
An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required.
Jitsi Desktop (previously SIP Communicator) is a legacy audio/video and chat communicator with full encryption, precedessor of Jitsi Meet .
Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography.
XMPP, or Extensible Messaging and Presence Protocol, is an open standard for instant messaging and real-time communication, allowing for message exchanges between any two entities on the Internet. It's known for its decentralized and extensible nature.
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Keybase seems to be really secure with encrypted messaging and an interesting way to verify your profile. I honestly like the design and its potential applications in a team environement.