HeySpace - HeySpace is the only free task and simple project management software with communication and collaboration feature.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Slack - A messaging app for teams who see through the Earth!

Drift - A messaging app that helps you grow your business.

Infolio - All-in-one project collaboration suite for fast results and easy teamwork

ChatSupport.co - ChatSupport is a live chat software for websites which lets you interact with website visitors and customers through customizable chat widgets.