Glip Alternatives for Linux

Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

Slack is a cloud-based team collaboration tool.

Trillian is a proprietary multiprotocol instant messaging application.

Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.

fluxday is a user-friendly, free & opensource task & productivity management tool for growing startups.

Rocket.Chat free open source chat solution.

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform.

HumHub is a free social network software and framework built to give you the tools to make teamwork easy and successful.

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 users of a different service provider via online chat, Voice over IP, and Videotelephony.

Active Collab is a web-based project management tool.

Zulip is a chat and collaborative software.

Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Gitter is an open source instant messaging and chat room system for developers and users of GitHub repositories.

buckets.co helps you optimize workflows & collaboration at all levels.