Which programs can I use to edit PDF files?

Option 1:

• Use calibre to convert the pdf file to rtf.
• Open the rtf file in OpenOffice.
• Make changes and then create a pdf out of it.

Option 2:

• PDF Studio is a complete PDF editor.But you have to pay for the developers as it is a commercial software.

Option 3:

• Use scribus it might be useful for complex visual edits.

Option 4:

• xournal

For PDF editing I have used a PDF Annotator flpsed . You are able to save edited files in postscript format or in PDF.

I frequently use Inkscape, GIMP eg. to fill in forms. (With such utilities like Imagemagic's convert, and pdftk [because they support just a single page only, you may join pages later].)

Also they wrote, that PDF Import extension feature to LibreOffice/OpenOffice.org may do what you want.