Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Roundcube - Web-based IMAP email client
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.