A tool to automatically fill out PDF forms with different values. It should use just about any spreadsheet program you can get your hands on.
I have to think this is a niche item but as someone who spends a lot of time with PDF, I know it will come up for me.
Websites:
http://bulkpdf.de/en
https://github.com/Tadelsucht/BulkPDF
http://www.softpedia.com/get/PORTABLE-S ... kPDF.shtml
License: AGPLv3
Status: Untested, claims portability