Yeah visualization is an open question but I agree this is something we could try to surface. It may also be a good topic for the Almanac.
Wappalyzer has a “Web Server” category, so we could use that:
SELECT
APPROX_TOP_COUNT(app, 10)
FROM
`httparchive.technologies.2019_03_01_mobile`
WHERE
category = 'Web Servers'
Apache 1486906
Nginx 1244678
IIS 402889
OpenGSE 141667
LiteSpeed 101963
OpenResty 70511
Apache Tomcat 30033
Express 18405
Phusion Passenger 15210
Amazon EC2 14503