Slack
Freemium
Slack is a cloud-based team collaboration tool.
Mattermost
Open Source
Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.
Zulip
Open Source
Zulip is a chat and collaborative software.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Matrix.org
Open Source
Matrix is an open protocol for real-time communication. It is designed to allow users with accounts at one communications service provider to communicate with…
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Compare Gitter with alternatives
Compare Dialog Messenger and Gitter and decide which is most suitable for you.