EMP is described as 'Highly secure messaging system. EMP uses end-to-end crypto, no more breaches, period' and is a Encrypted Chat app in the social & communications category. There are more than 10 alternatives to EMP for a variety of platforms, including Windows, Linux, Mac, BSD and Android apps. The best EMP alternative is Tox, which is both free and Open Source. Other great apps like EMP are Jami, Threema, I2P and RetroShare.
Technitium Mesh is a secure, anonymous, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. Primary aim of developing this instant messenger is to provide privacy which is achieved using cryptography and anonymity using Tor network.
TorChat is a peer to peer instant messenger with a completely decentralized design, built on top of Tor's location hidden services, giving you extremely strong anonymity while being very easy to use without the need to install or configure anything.
Echoplexus is an anonymous, web-based, IRC-like chatting platform that makes its best effort to respect your privacy. It allows you to create public or private channels. You can encrypt your chats. You can secure a pseudonym for linkable anonymity.
Encryption plugin for Pidgin, providing up to 4096 bit RSA encryption using the NSS crypto library from Mozilla. Keys are automatically transmitted and stored, making it very easy to use, but also resistant to man-in-the-middle attacks.
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