Delta Chat is a chat app that sends messages via e-mails, encrypted if possible, with Autocrypt. You do not have to sign up anywhere, just use your existing e-mail account with Delta Chat. Features: * Interactive web apps in chat for gaming and collaboration. * Reliable instant messaging with multi-profile and multi-device support. * Audited end-to-end encryption safe against network and server attacks. * FOSS software, built on Internet Standards, avoiding xkcd927. * Creation of a groups. * Multi-client. * Support Experimental of audio/video calls.