The Free Universal Construction Kit

How awesome is this? Having loved Legos as a kid and seeing all the new generation of construction toys my boys have to play with today, these are a dream come true. Now we can mate Tinkertoys to Legos to Lincoln Logs all in the same piece! The Free Universal Construction Kit is a set of 80 interoperability adapters between 10 popular construction toys including the aforementioned sets.

They're also available as download if you have your own 3-D printer. Now to I finally have a reason to buy a 3-D printer.