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

Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.

Jitsi Meet is an open-source (Apache) WebRTC JavaScript application that uses Jitsi Videobridge to provide high quality, scalable video conferences.

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…

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

TribeScale is an All-in-One platform to coordinate your team around what really matters - communication, goals, decisions, tasks and results.

Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.

Hibox provides task management, business chat and video calls.

Let's Chat is a persistent messaging application that runs on Node.js and MongoDB. It's designed to be easily deployable and fits well with small, intimate te…

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

Slack is a cloud-based team collaboration tool.

Cisco WebEx provides on-demand collaboration, online meeting, web conferencing and video conferencing applications.