Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Otr.to - A secure peer-to-peer chat in your web browser.
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.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.