Open source web authoring tools

I am a reformed FrontPage user, and am trying to find a suitable authoring tool for building "open source" webs, using templates such as these:

http://www.oswd.org/designs/favorites/

Where might I find a good shareware or freeware tool? Can anyone recommend a good one, free or for sale?

Thanks in advance.

How about: NVU - http://www.nvu.com/. I haven't tried it though.

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Thanks