PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.
PDFChef Merge PDF - PDFChef Merge PDF is an online tool that allows you to merge multiple PDf files into one quickly and securely.
TextGrabber - Office & Productivity