inSSIDer

Genuine geeks, whether professional or casual, need Wi-Fi tools that help troubleshoot WLAN networks. With inSSIDer, MetaGeek has created a gift that keeps on giving. Our award-winning, open-source Wi-Fi scanner software, inSSIDer, is an alternative to network scanners like NetStumbler. One big difference: inSSIDer actually works with Windows Vista, Windows 7, and 64-bit PCs.
Did we mention that it's FREE? you can download inSSIDer today for free and level-up your network scanning and troubleshooting capabilities. Once you give inSSIDer a try, please help us spread the word to the farthest reaches of Geekdom by telling your friends about MetaGeek's free Wi-Fi scanner software that works with the current generation of Windows operating systems.

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Winner of InfoWorld Best of Open Source Software Awards

Watch Tekzilla's review.

inSSIDer scans networks within reach of your computer's Wi-Fi antenna, tracks signal strength over time, and determines their security settings (including whether or not they're password-protected). Previously mentioned NetStumbler has long been a favorite for this sort of functionality, but it doesn't work well with Vista or 64-bit XP. inSSIDer, on the other hand, works like a charm on both Vista and XP, and it's open-source to boot. - LifeHacker
"I really like inSSIDer, which is open source and available to download from MetaGeek. ItÕs a simple tool that graphically displays all the networks visible in your area, along with their relative signal strength.
It also records signal strength over a five-minute period, which is particularly useful in an office environment as laptops pop on and off the network, and intelligent access points adjust their transmission power to match.
IÕve fired up a copy of inSSIDer in several different home and SME environments where the owners were complaining of poor wireless speeds and frequent drops, only to find their wireless router working on exactly the same channel as several of their neighbours, and so all of them were competing for a time-slice of the same frequency.
ItÕs so easy to spot these kinds of problems with a tool such as this, and with a quick change of channel the wireless network suddenly starts working properly again." - PC Pro