WiFi Stumbler is a free browser based WiFi hotspot finder. It may not be quite as sophisticated as some freeware like inSSIDer, but hey, there’s no download, just surf to the site and off you go. Can’t get easier than that.
Search for open networks, specific manufacturers of access points, a particular SSID or MAC address or any other string in the scan results using this field. You can also use standard Google search syntax. Click on “Advanced search” to expose a variety of filters to easily customize your displayed results.