Cryptocat

Cryptocat is an open-source, encrypted chat application designed to provide secure communications over the internet. Developed by Nadim Kobeissi, Cryptocat aims to protect users' privacy by employing end-to-end encryption, which ensures that messages are only readable by the participants in a chat, and not by anyone else, including the service provider. Originally launched in 2011, Cryptocat was built to be user-friendly and support multi-person chats.