Slack - A messaging app for teams who see through the Earth!
Yammer - Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Mattermost - Mattermost is an open source alternative to Slack.
Communifire - Enterprise Social Collaboration Software