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PDFsam basic is a completely free, platform independent software application designed to split and merge PDF documents. The application is stable, open source, and it should cover most of your needs. It has a simple graphical interface to let the user choose PDF files, split or merge them.
PDFsam is written in Java Swing that is a set of Java class libraries provided as part of Java 2 Platform, Standard Edition (J2 SE) to support building graphics user interface (GUI) and graphics functionality for client applications that will run on popular platforms such as Microsoft Windows, Linux, and Mac OSX.