The best open source alternative to gDoc Creator is PDFedit. If that doesn't work for you, our users have ranked more than 25 alternatives to gDoc Creator, but unfortunately only two of them is open source. If you can't find an alternative you can try to remove all filters.
Free (and open source) editor for manipulating PDF documents. GUI version + commandline interface. Scripting is used to a great extent in editor and almost anything can be scripted, it is possible to create own scripts or plugins.
qvPDF is a PDF creator for Windows, but you can also merge & split. Its implemented as printer driver and uses plugins to execute different actions after creating the PDF. Processing parameters can be written directly into the printed document like: @|mapi.mailto=me@you.
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