What are some alternatives?
G Suite - Google's encompassing suite of cloud-based business apps.
HubSpot - HubSpot is an inbound marketing and sales platform that helps companies attract visitors, convert leads, and close customers.
Zimbra Collaboration Suite - Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
Salesforce - CRM software solutions and enterprise cloud computing from salesforce.com, the leader in CRM and platform as a service.
Slack - A messaging app for teams who see through the Earth!
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.