QuarkXpress is a professional and very powerful page layout and graphic design software that lets anyone create and publish rich, compelling material for print, the web and other digital media using one easy tool. Its proven QuarkXpress is the must have software for in house, agency and independent designers. The newest version 9.5 is Intel only but looking back, I found some previous version that are PowerPC friendly.
* QuarkXpress – 8.5.1 – 10.4/10.5 (Tiger/Leopard) – (Free 30 days Test Drive) – http://www.quark.com/Products/QuarkXPress/ – Before purchasing, please contact the developers to make sure they will provide the right version and the compatible license, because you are required to sign-up before you can download, and try it for free.
System Requirements (page:5) – http://files.quark.com/download/documentation/QuarkXPress/8.5/English/QXP_8.5.1_ReadMe_en-us.pdf