The best replacement for kofax is captiva.

The best alternatives to kofax are rated as following:
★★★★★  captiva
★★★  datacap
★★  readsoft
★  twain
★  filenet capture

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

Other search terms related to kofax and their ratings are:
★★★★★ fujitsu
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Google Trends

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kofax
captiva
datacap