Just Forms PDF : Java PDF Library 

The JustFormsPDF library is a Java class library for filling or editing interactive PDF forms on-the-fly. This PDF library requires no other packages to be installed and will run easily from any Java project including JSP, Servlets and EJB.
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PDF Reader 

PDF Reader is a free program to view, modify and print pdf files. It is very small, only about 2 MByte to download. You can open, view, zoom and print PDF files. You can also modify pdf files (but you can not save them in the free version).
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zsCompare 

Manually or automatically compare files, folders, text files, source code, Word documents, Excel spreadsheets, and pdf files. You can even compare files within zip files. Includes zsDuplicateHunter a powerful duplicate file finder for free!
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PDF 2 Word 

With PDF 2 Word you can open a pdf file and save the content of the document as word file. The program uses the text objects of word and so the layout, that means the position of the the text, the pictures and vector graphics can be maintained.
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PDF Studio 

PDF Studio is a standalone application to add text and images, and to split or merge PDF documents. Common actions can be saved as stamps to be reused with a single click. PDF Studio works on Windows, Mac and Linux and does not require Adobe Acrobat.
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eXPert PDF ViewerX Control 

eXPert PDF ViewerX is a standalone PDF Viewer activex control for windows.Using Visual Basic, VC, Delphi or any other programming language/tool been able to handle activex controls, developers can build a customer interface for viewing pdf documents.
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