A way to extract layer sets from PSD files without Photoshop?

Are there any tools for (in order of preference) Mac, Linux, or Windows to extract images per layer set from a PSD file, without using Photoshop? I had a web designer send me a PSD file containing multiple pages, and each page is apparently in a layer set, and GIMP cannot handle these -- it can't understand layer groupings.

A command line tool, a rinky-dink Windows tool...anything will work (of course, free is preferable), so long as it does not leave watermarks or anything of the sort, and works well.

Solution 1:

The easiest solution might be to download the Photoshop trial version from Adobe.

Solution 2:

ImageMagick supports PSD layers and can extract them to separate image files. But I like Joe Internet's answer if you only have to do this once or twice.

Solution 3:

GIMP does read the layers (I use GIMP 2.6 sometimes) altough it doesn't understand layer properties made in photoshop (like borders and shadows) or folders (groupings) which are made in photoshop.

Paint Shop Pro opens PSD files too