WRAPI consists of a set of wireless LAN monitoring tools built for WindowsXP-based systems. WRAPI works with any IEEE 802.11b wireless network hardware vendor. WRAPI works on all wireless NICs (network interface cards) that have drivers for WindowsXP.
YAWCU is a wireless LAN (WLAN) capture + WEP cracking utility. It can crack 64/128 Bit WEP keys on IEEE 802.11b/g networks by monitoring WLAN traffic and computing the resulting WEP key once enough packets have been gathered