HeyTaco - Create stronger, happier teams that people love

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.

Karma bot for Slack - A bot that helps you build better people culture

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.

Backdoor - Honest and Anonymous Feedback About Colleagues

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