[ubuntu] Linux app for editable PDFs that's NOT Adobe?

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http://ubuntuforums.org – Okay, so here's the low-down. I am using reStructuredText to build PDF documents for the company that I work for. We use RST because of the relative ease with Mercurial versioning compared to OpenOffice documents (not that it would make a difference in this case). This is all well and good, except some of these PDFs need to be editable. I'm 99% sure there's no way to do this with RST, but is there any freeware out there that can let you make editable fields in a PDF that is already built? (Hardware)