NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android