at first i wondered what is psd and i found this site
htp://www.basictemplates.com/psd.shtml
QUOTE
PSD files are generally a layered file that is proprietary to Adobe PhotoShop. However, this file format has become so popular over recent years, that many other graphic software programs (newer versions) have programmed their software to be compatible with this file format. Adobe PhotoShop is an expensive program, however, two programs that I know can open and edit PSD files which are less expensive and quite good are Jasc Paint Shop Pro 7 and Ulead PhotoImpact 7 & 8.
also GIMP might handle this search gimp site for any info
(if so i think linux is better newer versions available faster, also devel can be installed)
greetz