qTox VS Empathy

Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.

Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.

Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.

Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.

uTox - µTox is the lightweight client with minimal dependencies; it not only looks pretty, it runs...

Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.