PDFKeeper is a free, open source program designed for Oracle Database. It provides an "upload, index, and search solution for PDF documents"....
PDFsam or PDFsam Basic is a free, open source program that allows you to perform various PDF actions such as; merge, split, page rotation, mix, extract and more....
Sumatra PDF is an open-source PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Microsoft Windows OS (runs on XP, Vista, 7 and 8)....
