Eclipse Memory Analyzer. GCViewer. Wireshark · Go deep. Zenmap - Nmap Security Scanner GUI. Zenmap is the official Nmap Security Scanner GUI. It is a multi-platform (Linux, Windows, Mac OS X, BSD, etc.) free and open source application which aims to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users. Frequently used scans can be saved as profiles to make them easy to run repeatedly. A command creator allows interactive creation of Nmap command lines. Scan results can be saved and viewed later.
Saved scan results can be compared with one another to see how they differ. You can download Zenmap (often packaged with Nmap itself) from the Nmap download page. Here are some Zenmap action shots (click for full res): Fiddler - Web debugging proxy.