PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
ABBYY FineReader - ABBYY's latest PDF editor software, FineReader 16 you can easily convert files like PDF to Excel, PDF to Word, edit, share, collaborate & more with this PDF editor!
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
Onlineocr.net - Free Online OCR service allows you to convert PDF document to MS Word file, scanned images to editable text formats and extract text from JPEG/TIFF/BMP files