| I use ProjectBuilder, the Macintosh development environment. It does basically what all those tools do (though less pretty) with the benefit of saving everything in straightforward text or rtf files. I can include images, too, and html. Downside is that of course it includes about a zillion features I will NEVER use (hm, "Define Class" just doesn't mean what I think it should), and it's kinda ugly, and it doesn't do text styling very well.
GMGen looks okay but my primary experience with PCGen is SSSSLLLLLOOOOWWWW. Oh, and incredibly ugly. I looked at GMGen but it seemed to be more of an in-game tool which I have no use for. But those screenshots have piqued my interest.
The tool I really want is not very complicated -- it lets me create rtf, txt and html files at will, keeps them neatly organized and does multi-file searches, allows me to open multiple panes so I can view two files at once. Supporting styles would be great, as well. | 
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