Loving this minimalist homage to the greatest mathematical companion/handheld gaming device of all time (Falldown, anyone?), created by Brooklyn Designer Jonathan Bobrow.
Did anyone ever use a graphing calculator to actually, like, calculate graphs? All I remember is playing Tetris and some Drugwars game. Kids these days have something crazier: Gossamer. It's a web browser for graphing calculators.
Who needs Texas Instruments? Not Matt Stack, creator of the Open SciCal. His homemade, 100% open source graphing calculator not only blows away the functionality of store-bought devices, but is the "ultimate status symbol among the nerdiest of the nerds."
It must be creative pipe week here at Gizmodo, because people keep sending in their awesome creations. And this might be the best one yet: a functioning TI-83 calculator with a pipe built into it.