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It really depends on what you want to do. If it's Dreamweaver or Golive, you could get away with using Notepad, given more time, or higher quality standards. On the other hand, there are a lot less apps that will stand in Photoshop's place. Paint.net is great, although it won't open jpegs from my camera - too many bites. The Gimp is fantastic, although I don't like the user interface.
CS stands for creative suite; they have a lot of software under that umbrella. Which one are you looking at?
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