Great site for pop-up and 3D cards with free files.
Great source of free files in various formats - Studio, GSD, SVG, DXf, AI.
Free files in SVG, Studio, GSD, DXF, MTC, PDF formats.
Beautiful intricate designs - FREE!
Free GSD, SVG files
Tons of free frame and doily diecuts for electronic cutters.
Christmas Corners by Bird
Loads of free files
http://www.krewellakreations.co.uk/blog/ - a great blog for free cutting files in all formats including Studio. Great terms and conditions for usage of her files.