Connectify Hotspot - Connectify Me hotspot is a PC app that turns your computer into a Wi-Fi hotspot.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
mHotspot - mHotspot is a completely free software which converts your windows 7 & 8 laptop into a virtual wifi router and creates a secure wifi hotspot.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Maryfi - Maryfi is a software program designed for laptops to start their own wireless hotspots.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.