Stylizer
Stylizer (Windows)
Two things make Stylizer a slightly different mindset than the others: it uses a grid interface instead of a text editor, and it has Firefox and IE embedded, so when the user changes the CSS, it’s propagated right away to the browser. The grid system makes CSS feel like “CSS on rails”, because it makes it impossible to have any CSS errors. It lets Stylizer do things such as a Firebug-like element inspector that lets the user diagnose and edit in the same place, and an editable, spotlight-style filtering system.