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.
Twinme - Twinme – Private Messenger is a free, secure, instant, and high-definition messaging app that protects your privacy along with giving you full control over each of your relationships and contents.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Textra - Textra is a seriously beautiful, feature rich SMS and MMS app.
Creativity 365 - Cross-device content creation suite
Material Messaging - Material Messaging is a beautiful communication app that lets you send and receive SMS and MMS messages using the intuitive interface while giving you complete control over every aspect of your messaging experience.