PDFedit is a free open source pdf editor and a library for manipulating PDF documents, released under terms of GNU GPL version 2. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a pdf editor.
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Library
The answer to this depends on what you need from an editor and what software you already have. MS Word - 2013+ If I am not mistaken I think starting in Office 2013 Word can edit PDF's. You just open the PDF in Word as if you were opening a document and it will convert it for editing and you can save back to PDF.
Multiplatform library working on Unix systems, Windows32/64 and also Windows CE and others. You can use it to read, change and extract information from a PDF file. It is based on xpdf library.
GUI
Which Is The Best Pdf Editor For Mac
PdfEdit includes pdf editor which graphical interface is based on QT3.x with all features implemented using scripting language; therefore, any user can modify the behaviour by scripts and plugins. See separete section for qt4 based windows pdf editor.
Formulate Pro For Mac (best Open Source Pdf Editor For Mac)
PDFedit is a free open source pdf editor and a library for manipulating PDF documents, released under terms of GNU GPL version 2. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a pdf editor.
Tools
Tools include example usage of the library which proved to be useful.
PDFedit gui is based on a project led by Jozef Misutka implemented by Eva Peskova and based on pdfedit library. It is still in beta state and we just establisthed the development process.
It included an installer and all the required libraries but standard c++ redistributables. Pdf editor should be able to open all pdf files on windows system. It is open source but not in the main branch of our VCS. Please, feel free to create new issues our bug tracking system if you experience any problems - see link in the second left menu or click here.
In the (hopefully near) future, it should be the same gui as on *nix systems.