The best replacement for autotask is connectwise.

The best alternatives to autotask are rated as following:
★★★★★  connectwise
★★★★  zendesk
★★  shockey monkey
★  tigerpaw
★  bluefolder
  worketc
  commitcrm
  sysaid
  mhelpdesk
  connect wise

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

Other search terms related to autotask and their ratings are:
★★★★★ kaseya
You have in mind a companion for autotask and it is not yet here? Propose!



Google Trends

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autotask
connectwise
zendesk