...Smoke is known as the first mobile McEliece Messenger:
https://tarnkappe.info/artikel/english/mceliece-messaging-smoke-crypto-chat-the-first-mobile-mceliece-messenger-published-as-a-stable-prototype-worldwide-279847.html
A web-based instant messenger client allowing you to connect to supported messengers (AIM, GTalk, MSN, Yahoo) via HTTP (or HTTPS). The Yafumato server connects to the messengers by proxy and provides a web interface, allowing IM access from anywhere.
foxTalkz is the total solution for chatting. It is built as a Firefox extension integrated with Google chat, and it does not need an internet connection to chat in the LAN.
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Blitz Messenger... a cross-platform/cross-browser/no-downloads-required application allowing an end-user to chat via their browser. Alls required on server side is Blitz and alls required on the Browser end is Javascript and a person willing to chat!
Y-Chat is a Chat program written in Java and html, accessible with a simple web browser through the internet (or even in LAN if wished). This only requires a JDK on the hosting server and a web browser for the end-user.