PDFedit is free and open source library for manipulating PDF documents, released under terms of GNU GPL version 2. It includes PDF manipulating library based on Xpdf, GUI and set of command line tools.
Library
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.
Ongoing activity: reimplementing of operators, adding more tools, fixing bugs
Tools
Tools include example usage of the library which proved to be useful.
Ongoing activity: adding tools on the fly mostly for easier bug fixing
GUI
Graphical interface based on QT3.x which heavily depends on scripting; therefore, any user can modify the behaviour by scripts and plugins.
Ongoing activity: porting to QT4, fixing bugs
