COI - Chat Over IMAP

COI - Chat Over IMAP - is a universal chat protocol that is Free, Open, Easy, Safe and does not require developers to build or maintain a server.

COI uses an email address and any IMAP server as its infrastructure. This means it can already connect 3.8 billion users - anyone with an email address.

Developers can now concentrate on building clients for any device, in any language (Java, Swift, JavaScript, Dart, Kotlin, etc.), and let COI handle the communication.

Yeah, right. IMAP?

Rspamd

Fast, free and open-source spam filtering system.

Super Mail Quest

A whole adventure game - running within an email.