The best replacement for crs is gds.

The best alternatives to crs are rated as following:
★★★★★  gds
★★★★★  clg
★★★★  eg
★★★  dig
★★  hrs
★★  cog
★★  fers
★★  hrpo
  tsm evo
  tcx
  gri

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

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



Google Trends

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crs
gds
clg