The best replacement for apache is iis.

The best alternatives to apache are rated as following:
★★★★★  iis
★★★★★  tomcat
★★★  nginx
★★★  cobra
★  apache2
★  blackhawk
★  gladiator
★  comanche
★  lighttpd
★  havoc
★  mit license
★  gpl
★  taliban
  cobra helicopter
  hind
  nginx for php
  viper
  cherokee
  nginx performance
  pulsar
  glassfish
  litespeed
  node.js
  iss
  yaws
  kiowa
  nginx php
  lotus
  sioux
  iis security
  iis web server
  iis for php
  unicorn
  navajo
  fz
  lighttpd raspberry pi
  qad
  insurgents
  windows server
  xampp
  black shark
  websphere
  iis windows
  iis 6
  iis 7
  squid

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

Other search terms related to apache and their ratings are:
★★★★★ ssl
★★★★ tomcat
★★★★ php
★★ php windows
★ passenger
★ virtual host
★ node.js
★ php-fpm
★ php extension
★ iis
★ ldap
★ openssl
★ php download
★ django
★ mod_rewrite
★ asp.net
★ nginx
★ mysql
★ rails
★ perl
★ mod_wsgi
★ jboss
suexec
asp
node
mod_ssl
authentication
mpm
ldap authentication
php and mysql
htaccess
mysql and php
You have in mind a companion for apache and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of apache in all years. Click on graph for more.
apache
iis
tomcat