Does anyone know where I can find a completely offline tool that does what this site does?
The source for this seems like a bit of overkill. I'd like to be able to use a cli based tool that shows me relevant man sections for the flags I chose for example
Don't forget that if their software is changing the certificates for every HTTPS site you visit they're probably doing it on the fly. This means that the private key is on your computer. Assuming they generate a per install private key that won't be a big issue but if it's the same private key for all their installs it could get pretty bad once someone gets the key