concatenate tiff files

How can I create a multi-page TIFF file?

On OS/X it looks like tiffutil can do that. http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/tiffutil.1.html

On Windows, TiffCombine costs $50 but has Trial version. http://www.topshareware.com/TiffCombine-download-35950.htm

If you have any experience with these or other solutions, please add them here.