Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Roundcube - Web-based IMAP email client
Creativity 365 - Cross-device content creation suite
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
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.
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.