Google Capture the Flag 2017 - Google's 2nd annual worldwide security competition
Google Open Source - All of Googles open source projects under a single umbrella
Startup Security Program by Templarbit - Security practices & tools required to close large deals
SmallDevTools - Handy developer tools with a delightful interface
The Security Checklist - The Practical Security Checklist for Web Developers
whatdevsneed - This is whatdevsneed.