Adobe offers free
downloads of its Adobe Creative Suite 2 for Windows or Mac
. (You must have an Adobe account to download this software; membership is free.) That's tied with our January mention (of the very similar CS2 Premium Plus software) and is the lowest total price we could find. Included programs are Photoshop CS2, Creative Suite 2, GoLive CS2, Illustrator CS2, InCopy CS2, InDesign CS2, and more.
Note that Adobe recommends that these downloads are intended for customers who have already purchased CS2. This software was released in 2005, so there will be significant compatibility issues with newer operating systems.