Jquery.equal-heights is a project mainly written in ..., it's free.
A small plugin to set the height of a collection of elements to the tallest one
jQuery.equalHeights
A simple plugin that takes a collection of elements and sets their height to the tallest one.
pendingpendingsource: this // set the collection to grab the heights from
target: this // set the target collection to assign the maximum height to
offset: 0 // useful for subtracting pixel values according to top & bottom padding