wappalyzer is also good[1].

1. https://chrome.google.com/webstore/detail/wappalyzer/gppongm...

I had the Debug mode on, which gives MANY information about the stack and all that :)

this makes sense...but still he knows which database you are using. I dont think debug errors give that information. Or does it???

With Django debug toolbar or even flask debug toolbar, you can have this can of information.

It does