qTox - A Qt graphical user interface for Tox.
FluffyChat - Open. Nonprofit. Cute ?
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Olvid - The most secure messaging app in the world.
Toxic - Toxic is a client with an ncurses interface, written entirely in C.
Molly (Signal fork) - Molly is an independent Signal fork for Android