Heatmapper

Want to figure out Wi-Fi coverage at your home? Think the nearby Starbucks' Wi-Fi is interfering with your Wi-Fi? Stop guessing. Start seeing. HeatMapper is the little brother of Ekahau Wi-Fi Site Survey and Planner, enterprise Wi-Fi planning and wireless site survey tool. Features: See Wi-Fi coverage on a map. Locate all access points. Find available networks. Detect security settings. Supports 802.11n, as well as a/b/g. Works on pretty much any Windows laptop. Free of charge, one-minute install.