What are some alternatives?
Slack - A messaging app for teams who see through the Earth!
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Glip - Glip is fully searchable, real-time group chat & video chat, task management, file sharing and more, in one easy-to-use app. Get started FREE today.
Cisco Jabber - Cisco Jabber lets you access presence, instant messaging (IM), voice, video, voice messaging, desktop sharing, and conferencing.
Mattermost - Mattermost is an open source alternative to Slack.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.