The best replacement for icetool is sort.

The best alternatives to icetool are rated as following:
★★★★★  sort
★★★★  syncsort
★★★  prismaster
★  synctool

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Speaking about icetool, one probably shouldn't forget about splice.

Other search terms related to icetool and their ratings are:
★★★★★ splice
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icetool
sort
syncsort