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1. PDFsam, a desktop application to split, merge, mix, rotate PDF files and extract pages

   Java 4.3k 390

2. An extendible and configurable PDF manipulation layer library written in java.

   Java 540 69

3. A PDFBox fork intended to be used as PDF processor for Sejda and PDFsam

   Java 55 21

4. Event bus implementation providing pub/sub pattern with events queue

   Java 7 2