Lux has it's own installer and can be uninstalled.

LuxPose alpha is just unzipping somewhere, if you unzip it into its own folder and not directly into the PoserScripts folder, you can just delete the folder if you don't like it, otherwise you have to hunt down multiple folders and files :-) 

Adobe Air and the LuxPose UI using Adobe Air can be uninstalled like any other application, too.