Here’s an old Makezine article about open furniture designs.
I would have thought the opendesk designs were freely downloadable, but can’t find actual download links…
There are a bunch of downloadable designs at atFAB, although they do want your email address to download…
There are a lot of cool smaller scale designs at ZenziWerken.
Someone here on the forums recently posted one of Derek Hugger’s Kinetic Sculptures.
I think it’s more fun to design your own though. I shared a chair and footstool design of my own right here on the V1 forums. I think @jeffeb3 has a step stool design out there somewhere (thingiverse maybe). Perhaps Ryan could create a place to share designs here? I think that would be awesome !