7. Meraki WiFi Stumbler
This is a simple web-based stumbler, freely available on the Meraki website. It runs in most browsers on Macs and PCs, and even works when offline. It displays most of the basic wireless details (with signal levels in percentages) and offers a bar graph of APs per channel.
It doesn’t allow any customization and doesn’t offer any additional functionality beyond displaying the network basics and letting you perform searches of the data. However, this stumbler is still useful if you want to check wireless signals from a computer that doesn’t already have a stumbler installed.