PDFedit - Free (and open source) editor for manipulating PDF documents. GUI version + commandline interface.
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.
Master PDF Editor - Master PDF Editor is complete solution for editing PDF and XPS files.
ScanKromsator - Scan Software with several advanced options