PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
PDFzorro - PDFzorro is a web based source for enjoying the professional level of PDF editing.
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
DocFly - The Best Online PDF Editor. Create, Edit & Convert up to 3 PDF Files a month for FREE with the best free pdf editor!
PyPDF2 - PyPDF2 - A utility to read and write pdfs with Python
FoxPDF PDF Editor Ultimate - FoxPDF PDF Editor Ultimate is an all in PDF creator, editor and Word editor that is expert in perming multiple functions in addition to performing simple creating and editing functions.