This is an old question, I know, but none of the answers to date actually addressed the OP QUESTION. She asked for options for using XSL-FO, not "how to generate PDF using code?".
The primary non-commercial answer on the actual question is:
Apache.org Project's FOP
Formatting Objects Processor. It takes XSL-FO compliant xsl code and xml and generates PDF files according to the XSL-FO spec. There are several other commercial options:
- Ibex PDF Creator
- AntennaHouse
- RenderX
If you're looking for an open-source option that WORKS, FOP is it. The FOP is a Java library natively, but it has been ported to .NET via J# (That has it's own issues there I know) in the nFOP project.
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