Angry IP Scanner is a small open source Java application which performs host discovery ("ping scan") and port scans. The old 2.x release was Windows-only, but the new 3.X series runs on Linux, Mac, or Windows as long as Java is installed. Version 3.X omits the vampire zebra logo. As with all connect()-based scanners, performance on Windows XP SP2 and newer be poor due to limitations added to tcpip.sys. The FAQ provides details and workarounds. A short review was posted to nmap-dev in 2008.
For downloads and more information,
visit the Angry IP Scanner homepage.
Angry IP scanner is an old school tool that has held a place in my tool-box for a very long time. It's slim, and does exactly what it says it does. It's most certainly on on a level with Metasploit, but you don't always need to pen test a network to get the job done.
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