The best replacement for cgi is php.

The best alternatives to cgi are rated as following:
★★★★★  php
★★  asp
★★  fastcgi
★★  servlet
★★  isapi
★  hand drawn animation
★  perl
★  stop motion
★  cg
★  pgt
★  wsgi
★  jsp
  servlets
  pl
  module
  kompressor
  practical effects
  dso
  models
  iis fastcgi
  accenture
  apache module
  visual effects
  iis isapi

Your alternative for cgi is not listed? Suggest!
Speaking about cgi, one probably shouldn't forget about perl.

Other search terms related to cgi and their ratings are:
★★★★★ perl
★★★ python
movies
You have in mind a companion for cgi and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cgi in all years. Click on graph for more.
cgi
php
asp