Remove third party software from lightroom

Afternoon all,

I was wondering if anyone knew how to remove thirdparty software from Lightroom. Most of them I have already uninstalled but still appear in lightroom.

Many thanks

Goto LR's Preferences Menu, and select the External Editors Tab... about mid-way down, right-click, there's a dialogue to select an external program... if you look toward the bottom of the popup, you'll see an option to Delete the Selected External program.