The best replacement for stages is continuity.

The best alternatives to stages are rated as following:
★★★★★  continuity
★★  phases
★★  quarq
★★  powertap
★★  power2max
★  continuous development
★  srm
★  grief
★  icrate
★  x pole
★  freud
  puppy food
  steps
  gfr stages
  grades cancer

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

Other search terms related to stages and their ratings are:
★★★★★ ages
★★★★ poles
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stages
continuity
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