Not used or heard of Kicad designspark is based on the same as eagle which I think you can import the files, Tried designpsark but prefer Altium loads better
Deesignspark is good and free but centred on one companies catalog. Kicad is good and free but independent and user supported.
I find Kicad to be excellent and each new release has new goodies added to it. You can import many other types of CAD file through user written converter programs.