This filter is designed to convert say to tellraw commands. It also works with tell commands. It was a plugin request from qwertyuiopthepie for this map that he is currently working on updating for 1.8. It is easy to use, but watch the video to learn all of the functionality.
UPDATED 5/20/14 – Added support for Player selectors due to 14w20b adding the support for the selector tag in a tellraw command. This filter now should work with any say command that you try to use it with.