MacStumbler is a utility to display information about nearby 802.11b and 802.11g wireless access points. It is mainly designed to be a tool to help find access points while traveling, or to diagnose wireless network problems.
New in this version:
-fixes "Unexepectedly quit" error at startup
-Window correctly remembers position
-Toolbar remembers configuration
If you like MacStumbler you may donate
here.
Requirements:
-OS x 10.1 or greater.
-an Apple Airport Card
-MacStumbler doesn't currently support any kind of PCMCIA or USB wireless device.
Author's Site
MajorGeeks TX
Internode
Screenshot