The best replacement for middleman is jekyll.

The best alternatives to middleman are rated as following:
★★★★★  jekyll
★★★★  octopress
★★★  nanoc
★★★  yeoman
★★★  middleman
★★  docpad
  deadaim

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

Other search terms related to middleman and their ratings are:
★★★★★ haml
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middleman
jekyll
octopress