The best replacement for netstumbler is inssider.

The best alternatives to netstumbler are rated as following:
★★★★★  inssider
★★★  ministumbler
★★★  kismet
★★  vistumbler
★  wireshark

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

Other search terms related to netstumbler and their ratings are:
★★★★★ atheros
You have in mind a companion for netstumbler and it is not yet here? Propose!



Google Trends

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netstumbler
inssider
ministumbler