Charles

Charles screenshots

Monitors HTTP connections and allows injection of packets
Internet Browser Autoconfiguration Plugin
Charles 3.8 : Internet Browser Autoconfiguration Plugin

Alternative downloads

Fiddler
Web debugging proxy that displays Internet traffic from your PC.
4.6.2.3
FREE
ANTS Performance Profiler
Boost the performance of your applications with .NET profiling.
10.1.0.1067
Web Sniffer
Debugging proxy for you to use with your browser.
0.1.5
FREE