Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Flow - Stop managing projects from your inbox.
Rocket.Chat - Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
Kwayet - Team chat & collaboration app, a simple way to Slack
Zoho Office Suite - Zoho's new office suite of apps.
Dropbox Paper - A collaborative document-editing service