Get it here.
Win and Linux version available for download.
It is a freeware tool to:
analyze a Wii game ISO file (or directly the DVD on linux) and tell you :
which is the region of the game (and other informations)
which is the region of the update
if there is a firmware update inside
if there is a risk to perform this update
if the update has already been modofied by WUM
patch the update of this iso to :
put an inerte update inside : function Brick Block
replace by another update : can be use to make tests or unbrick semi-bricked wii