Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
Creativity 365 - Cross-device content creation suite
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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.
PowerMTA - PowerMTA is an industrial-strength software for high-volume email delivery.