cros.download provides a basic tool required for many exploits as a requirement. It is a website which enables you to download old versions of chromeOS for your Chromebook. 
Old versions may have vulnerabilities which are now patched; thus, these old chromeOS images are essential for many exploits!

Recovery image directory:
Website: https://cros.download/
Created by Mercury Workshop

Channel versions and recovery images:
https://cros.tech/
