The best replacement for beyond compare is winmerge.

The best alternatives to beyond compare are rated as following:
★★★★★  winmerge
★★★★  kdiff3
★★★★  araxis
★★★  diffmerge
★★★  ultracompare
★★★  meld
★★  freefilesync
★★  windiff
★★  kaleidoscope
★  araxis merge
★  kdiff
★  examdiff
★  goodsync

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Speaking about beyond compare, one probably shouldn't forget about clearcase.

Other search terms related to beyond compare and their ratings are:
★★★★★ clearcase
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Google Trends

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beyond compare
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