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

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

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

Mavenlink is an advanced project management, task collaboration, resource allocation, work management and professional services automation platform.

Bizimply provides scheduling and attendance without the paperwork.

Station is an opensource app aggregator and browser.

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

Dapulse is a smart collaboration and communication app you can use to get your team members working in sync in one place.

Hubgets provides chat, voice and video turning team communication.