CDPSnarf is a network sniffer exclusively written to extract information from CDP packets. It provides all the information a "show cdp neighbors detail" command would return on a Cisco router and even more.
braa
Braa is a mass snmp scanner. The intended usage of such a tool is of course making SNMP queries - but unlike snmpget or snmpwalk from net-snmp, it is able to query dozens or hundreds of hosts simultaneously, and in a single process. Thus, it consumes very few system resources and does the scanning VERY fast.
Nmap
Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.
Bluelog
Bluelog is a Linux Bluetooth scanner with optional daemon mode and web front-end, designed for site surveys and traffic monitoring. It's intended to be run for long periods of time in a static location to determine how many discoverable Bluetooth devices there are in the area.
BlindElephant
The BlindElephant Web Application Fingerprinter attempts to discover the version of a (known) web application by comparing static files at known locations against precomputed hashes for versions of those files in all all available releases. The technique is fast, low-bandwidth, non-invasive, generic, and highly automatable
bing-ip2hosts
Bing.com is a search engine owned by Microsoft formerly known as MSN Search and Live Search. It has a unique feature to search for websites hosted on a specific IP address. Bing-ip2hosts uses this feature to enumerate all hostnames which Bing has indexed for a specific IP address.
Automater
Automater is a URL/Domain, IP Address, and Md5 Hash OSINT tool aimed at making the analysis process easier for intrusion Analysts. Given a target (URL, IP, or HASH) or a file full of targets Automater will return relevant results from sources like the following: IPvoid.com, Robtex.com, Fortiguard.com, unshorten.me, Urlvoid.com, Labs.alienvault.com, ThreatExpert, VxVault, and VirusTotal.
apache-users
This Perl script will enumerate the usernames on any system that uses Apache with the UserDir module.
Amap
Amap was the first next-generation scanning tool for pentesters. It attempts to identify applications even if they are running on a different port than normal.
ace-voip
ACE (Automated Corporate Enumerator) is a simple yet powerful VoIP Corporate Directory enumeration tool that mimics the behavior of an IP Phone in order to download the name and extension entries that a given phone can display on its screen interface.