NetStumbler (Network Stumbler) is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards.
License: Free
NetStumbler is a Windows-only tool that's easy to use but lacks updates and modern protocol support, making it less suitable for advanced users. In contrast, KisMAC is an open-source macOS application with advanced features and better support for wireless analysis but may require specific hardware and has a steeper learning curve.