Gmip shop
If you haven’t heard, Scott Moshella of plasticbugs.com has released a hack version of the Gimp with all the standard photoshop menus. If you want to learn photoshop but don’t have $500 to spend, this is the way to go.

direct downloads
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WinXP part of GIMPshop which includes the Dewierdifyer plugin and a Windows GTK theme for that Windows feel. Weighs in at only 8 Megs.For win XP
Mac os x Get the updated GIMPshop binary here for Mac OS X 10.3. (43 MB Download)
OS X version
and last but not least linux Go here for Very detailed instructions by Suramya Tomar for compiling and installing GIMPshop under Linux.
download links for linux can be found Here