Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Kin Calendar - The simple and connected calendar
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.
Calendly for Chrome - Schedule meetings without leaving your inbox
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.