The best replacement for idle is idol.

The best alternatives to idle are rated as following:
★★★★★  idol
★★★★  roberts
★★★  stoltz
★★★  turn off engine
★★  ambler
★★  ipython
★★  abandoned land
★★  bogosian
★★  lindros
★★  blore
★★  lazy
★★  shut off car
★★  clapton
★  not to idle
★  pythonwin
★  away
★  fast idle
★  amber
★  canopy
  bana
  pyscripter
  burdon
  curb idle
  turn the car off
  stolz
  4 corner idle
  turning off car
  turn off
  2 corner idle

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

Other search terms related to idle and their ratings are:
★★★★★ ipython
★★★ python
★★ no check engine light
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Google Trends

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idle
idol
roberts