Mailtraq - Mailtraq is a commercial groupware and webmail server system for the Windows operating systems.
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.
Eudora Internet Mail Server - Eudora Internet Mail Server is a highly advanced internet mail system that supports the all kind of email systems and clients either it is IMAP, POP3, SMTP and much more.
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.