NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
CrackStation - CrackStation is a web-based service that is used for retrieving passwords by cracking their hashes.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
MDCrack - MDcrack is a an aggressive cracker for MD2 MD4 MD5 HMAC-MD4 HMAC-MD5 NTLM PIX IOS APACHE FREEBSD IPB2 CRC32 CRC32B ADLER32 hashes
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
hashcat - The World's Fastest CPU/GPU powered password cracker.