http://www.whatsmyserp.com/serpcheck.php
http://www.blackhatworld.com/seo/get-google-serp-position-checker-script-written-in-php.663486/
https://github.com/noc2spam/KeywordTracker
http://andreyvoev.com/programming/simple-serp-tracker-php-class/
http://stackoverflow.com/questions/14612697/serp-tracker-php-script
http://www.ahowto.net/project/google-serp-checker-using-google-ajax-search-api%E2%80%8F/
http://www.web-max.ca/PHP/misc_12.php
http://www.fromzerotoseo.com/scraping-google-serp/
http://codecanyon.net/item/gchecker-softpae-google-position-checker-app/2369534
http://codecanyon.net/item/seo-google-serp-rank-tracker/3758371
