Noeone

Instructables - Learn How To Make Cool Do It Yourself DIY Projects From Step By Step Instructions & Recipes - Instructables

3d laser scanner
3-D Laser Scanner - Instructables Cool How To & DIY [category: art]
David 3D scanner - Instructables Cool How To & DIY [category: tech]

3 axis cnc milling machine
Easy to Build Desk Top 3 Axis CNC Milling Machine - Instructables - The World's Biggest Show & Tell - art, craft, diy, food, games, home, life, offbeat, ride, tech [category: tech]

Thermite
Thermite - Instructables Cool How To & DIY [category: offbeat]

VOLUMETRIC PROJECTOR
MAKE a VOLUMETRIC PROJECTOR from JUNK - Instructables Cool How To & DIY [category: tech]

Invisible book self
Invisible Book Shelf - Instructables Cool How To & DIY [category: home]

Even hydroponics
Hydroponics - at Home and for Beginners - Instructables Cool How To & DIY [category: home]

They have some great projects and you can even post your own stuff.

Edit: One thing about the thermite, magnesium doesn't always ignite it, you can use a sparkler but make sure you find some way to light it from a good distance (it can sometimes ignite the thermite almost as soon as you light it).

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In any case civilization has made mankind if not more bloodthirsty, at least more vilely, more loathsomely bloodthirsty. In old days he saw justice in bloodshed and with his conscience at peace exterminated those he thought proper. Now we do think bloodshed abominable and yet we engage in this abomination, and with more energy than ever. Which is worse? -Fyodor Dostoevsky