The best replacement for axure is omnigraffle.

The best alternatives to axure are rated as following:
★★★★★  omnigraffle
★★★★  irise
★★★★  visio
★★★★  invision
★★★★  balsamiq
★★★  uxpin
★★★  justinmind
★★★  proto.io
★★★  fireworks
★  protoshare
★  hotgloo
★  prototyper
★  sketchflow
  adobe fireworks
  mockflow

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

Other search terms related to axure and their ratings are:
★★★★★ sitemap
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Google Trends

Scale is based on the average worldwide traffic of axure in all years. Click on graph for more.
axure
omnigraffle
irise