There's an awful lot of useful Open Source software available. Where commercial programs tend to have the edge is not so much in the results as in things like work flow and interfaces - they're easier to use and particularly they're easier for groups of people to use, because companies like Corel and Adobe have the resources to put the software together more quickly than the open-source community can and because that's where the market is. I don't think anyone could tell just from the image whether a photo had been Gimped or Photoshopped, for example (proprietary filters and things apart). That's why there is no real open-source alternative to Dreamweaver - it isn't its WYSIWYG editor, which is only so-so, it's the templating and other stuff which puts it on another plane.
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