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
NetSpot offers a comprehensive suite of features for Wi-Fi analysis, including heatmap generation, network security assessments, and customizable reports, making it ideal for professional users. In contrast, NetStumbler is a lightweight, open-source tool suitable for basic network scanning but lacks advanced features and support.