PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
Nitro Pro - An affordable Adobe Acrobat alternative for editing and creating PDF
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
PDF Scissors - Crop pdf. Drop margin, whitespace. Auto crop all pages. Easy feature to make nice cropped pdf for ebook readers such as Amazon Kindle, Sony, Cybook etc.