Cryptocat - Chat with Privacy

[Ink]

Download Cryptocat

Encrypted IM can be easy and accessible.

• 
  Cryptocat is free software that aims to provide an open, accessible Instant Messaging environment that encrypts your conversations and works right in your browser.
• Cryptocat is an open source experiment — the goal is to provide the easiest, most accessible way to chat while maintaining your privacy online, because we believe in Internet privacy.

It's useful for everyone.

• Friends use Cryptocat to talk without revealing messages to a third party. LGBTQ activists use Cryptocat to keep private matters private. Journalists use Cryptocat to keep their stories and research confidential. Cryptocat is made for everyone.
• Cryptocat is not a magic bullet. You should never trust any piece of software with your life, and Cryptocat is no exception
  Read the full list of warnings.

Open source, open documentation.

• Cryptocat is developed under a principle of radical transparency. Our code, server configuration, network operations, audits, funding and everything in between is released for review, improvement and scrutiny.
• Our software is openly documented. Head over to the development wiki for threat models, server configurations, architecture lifecycle documents and more.

 

[DrBeenGolfing]

Excellent - perfect for our times. Zoner AV for Android also has an encryption messaging service built-in to it. Both parties have to have Zoner installed, though.