Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Google Capture the Flag 2017 - Google's 2nd annual worldwide security competition
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.
Startup Security Program by Templarbit - Security practices & tools required to close large deals
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.
The Security Checklist - The Practical Security Checklist for Web Developers