=== PHP ===
* Categorizr https://github.com/bjankord/Categorizr (Note: no longer maintained)
* Detector (Drupal) https://drupal.org/project/detector / http://detector.dmolsen.com/
* Mobile-Detect https://github.com/serbanghita/Mobile-Detect / http://mobiledetect.net/ / http://code.google.com/p/php-mobile-detect/