FO Tool is a little helper application which eases the development of stylesheets for XSL-FO processing if you don’t use an XSL-FO editor, but only an XML editor. FO Tool is written in Java and can be downloaded and started through Java WebStart.
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Currently the FO Tool is only available and tested on Windows. Since it uses SWT (from Eclipse) it contains platform-dependant libraries and lacking a Unix environment I cannot test right now.
Unfortunately, this tool is quite out-dated, but I find that some people are still using it. I hope I can one day create a better tool like that.