"An Ulu is the most useful knife ever, it is the Inuit suvival tool. An Ulu can be made of metal or even stone!!
LOL It is not a common tool so I'll plug it every time I can.

some of what you can use an Ulu for

hide preperation / scraping
Game processing tool
Fish scaling/ gutting tool
Wood splittling / branch cutting
Kitchen knife
Wood shaping/ debarking (its great for stripping birch bark)
to shave / cut hair (how it got named "the womans knife" by European settlers grrr)
to cut ice (used in igloo construction/ ice fishing/ seal hunting)
The primary tool in kayak construction
Can be used to work some stone such as soap stone in precise ways into useable pots/tools/dishes ect
Used in traditional harpoon construction

There are too many uses to list it beats the hell outta a multi tool and it is only one blade :D
I'll go outside of the normal Modern or European toolchest if I find something to be utterly useful it is one of the most versitile knives I have ever owned.

The current Ulu I use was a gift from an Inu freind of mine. I've made three or four of my own but I prefer the first one. LOL I guess I am a sentimental bastard sometimes lol. "