The best replacement for iis express is iis.

The best alternatives to iis express are rated as following:
★★★★★  iis
★★★  development server
★★★  cassini
  iis web server

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Speaking about iis express, one probably shouldn't forget about https.

Other search terms related to iis express and their ratings are:
★★★★★ https
★★★★ windows authentication
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Google Trends

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iis express
iis
development server