You can use these 3 tools
Which lists all the technologies, the website is apparently using.
You can run this command
wget --save-headers google.com
This will save the server header information in an index.html file, which you can open in an editor to view site’s server details.
You can use Curl command like this,
curl -I www.example.com
This will dump the server details like below, Example:
$ curl -I www.google.com