The SaaS CTO Security Checklist - The security checklist all CTOs should follow
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Startup Security Program by Templarbit - Security practices & tools required to close large deals
Google Project Shield - Google's DDoS protection service
Redacted - Easily blur/pixelate/black out parts of an image
SSL Alerts - Free service to send SSL certificate expiration alerts