Nipper processes network device configuration files, performs a security audit and outputs a security report with recommendations and a configuration report. Nipper supports a variety of devices from Cisco, Juniper, CheckPoint, Nortel and SonicWALL. Reports can be generated in HTML, XML, LaTeX, or plain text.
Check out the online version hosted on PacketLife [here](/toolbox/nipper/).
Unfortunately the open source application was monetized by its developers. The last version of GPL-protected source code is available in the local [repository](/repository/).