SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Snapchat - Real-time picture chatting
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
StealthChat - StealthChat is Encrypted, Private, Secure Calls and Chats on Android and Apple iOS