The best replacement for citect is wonderware.

The best alternatives to citect are rated as following:
★★★★★  wonderware
★★★★  clearscada
★★★  wincc
★★  rsview

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Speaking about citect, one probably shouldn't forget about omron.

Other search terms related to citect and their ratings are:
★★★★★ omron
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citect
wonderware
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