NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.