I love open-source in general and have worked over LAMP Stack using most
sophisticated to most dev freindly tools ( Drupal, WordPress, CodeIgniter).
with the direction and vision it's currently moving in and shaping into.
Summing up, i can converse in
- Drupal, CodeIgniter, Wordpress ( or PHP, PHP, PHP )
& yehs, sugercaoat: jQuery, jQueryMobile, Angular JS, etc.
and fortunately, machines do get 'em in one go ( most of the times...