Fully automated decryption tool using natural language processing & artifical intelligence, along with some common sense. Input encrypted text, (hopefully) get the decrypted text back. You don't know, you just know it's possibly encrypted. Ciphey will figure it out for you. Ciphey can solve most things in 3 seconds or less.
Docs: https://docs.ciphey.online/en/latest
Ciphey can even be imported as a module in your own Python code!
It's basically the cryptographer's workbench I was going to write while I was in Pittsburgh.
A curated list of all capture the flag tips and strategies.
CTFd is a Capture The Flag framework focusing on ease of use and customizability. It comes with everything you need to run a CTF and it's easy to customize with plugins and themes.
Awesome list of curated hacking infosec pentesting resources.
A utility that generates random VMs for security training. Give it a set of parameters in XML and it'll build vulnerable VMs for you to practice with. Uses Puppet, Packer and Vagrant to build the images.