Resources for the collection of Open Source Intelligence
These resources are links to tools and online data collection sites that can be used for the information gathering phase of penetration testing and organizational security assessments.
Other uses are researching organizations to determine the corporate structure, information technology capabilities and a great deal more.
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| Standalone Tools | Notes |
 Maltego | Start searching with this and you will wonder how deep the rabbit hole goes! |
| FOCA | A windows tool for information gathering, search engines, metadata and more |
 Fierce | Perl based DNS scanner, includes brute forcing of subdomains and IP neighbours |
| DNS Enum | Alternative to Fierce, also perl based with nice clean output |
| Online Tools | Notes |
| the ultimate intelligence gathering and recon tool? | |
 Shodan | a search engine for internet connected devices that indexes the service banners |
 Google Hacking Database | Google Dorks from the GHDB |
| More Resources | Notes |
 Spy Logic Series - Part 1 | intel gathering article social networks |
| Spy Logic Series - Part 2 | intel gathering article part2 - blogs, forums and metadata |
| Spy Logic Series - Part 3 | intel gathering article social networks monitoring |
| Tutorial on Footprinting | Passive information gathering tutorial |