NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Connectify Hotspot - Connectify Me hotspot is a PC app that turns your computer into a Wi-Fi hotspot.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Virtual Router Plus - Download Virtual Router Plus Windows Wifi Hotspot for free.
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.
Baidu WiFi Hotspot - Turn your PC into a hotspot for mobile devices.