The best replacement for nant is msbuild.

The best alternatives to nant are rated as following:
★★★★★  msbuild
★★★  ant
★★  rake
★  cruisecontrol.net
  cruisecontrol net

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

Other search terms related to nant and their ratings are:
★★★★★ msbuild
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