GHDB - Google Hacking Database (Google dorks)
Google stores a lot of information and crawl sites constantly. This information can be used in pentest interests.

Key search engines


Huge GHDB base is on exploit-db.com (по-русски (хабр))

Using manually written queries may be wrong idea. Write them on your own for current situation.
Lists and automated tools must be used to collect information of interest for further analysis.

google-dorks gist - listing of a number of useful Google dorks

Google keywords

Punctuation and symbols:

operator meaning examples
+ Search for Google+ pages or blood types +Chrome or AB+
@ Find social tags @agoogler
$ Find prices nikon $400
# Find popular hashtags for trending topics #throwbackthursday
- Exclude web-pages with specified words or site Examples: jaguar speed -car or pandas -site:wikipedia.org
" When you put a word or phrase in quotes, the results will only include pages with the same words in the same order as the ones inside the quotes “imagine all the people”
. Any symbol  
* Any text “a * saved is a * earned”
.. Number range camera $50..$100

Search operators:

operator meaning examples
site: Get results from certain sites or domains olympics site:nbc.com and olympics site:.gov
inurl: Get results with specified word in uri (searches after site name) inurl:news
IP: (bing and yahoo) Search by IP-address IP:88.198.55.240
intext: Search in web-page body intext:passwd
intitle: Search in web-page title tag intitle:”index of”
ext: / filetype: Search pages with special extension ext:pdf
     
related: Find sites that are similar to a web address you already know related:time.com
link: Search sites refering to specified site link:wikipedia.com
OR Find pages that might use one of several words marathon OR race
info: Get information about a web address, including the cached version of the page, similar pages, and pages that link to the site info:google.com
cache: See what a page looks like the last time Google visited the site cache:washington.edu
define: Show definition of term define:0day