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.
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.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 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.