Zabbix is listed here for it's Network Mapping and visualisation capabilities, but it is truly a Monitoring application.
* Discovery by IP range, services and SNMP
* Automatic monitoring of discovered devices
DirBuster is a multi threaded java application designed to brute force directories and files names on web/application servers. Often is the case now of what looks like a web server in a state of default installation is actually not, and has pages and appl ...