The best replacement for kismac is kismet.

The best alternatives to kismac are rated as following:
★★★★★  kismet
★★★★★  istumbler
★★★★★  aircrack
★★★  netspot
★★  aircrack-ng

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Speaking about kismac, one probably shouldn't forget about alfa awus036h.

Other search terms related to kismac and their ratings are:
★★★★★ alfa awus036h
★★ wpa
★★ alfa
★ aircrack
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Google Trends

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kismac
kismet
istumbler