Software for de-skewing and cropping images
- YASW
- Advanced version of Book Scan Wizard
- ScanTailor
- full purposed image processing for scanned books
- does not seem to be suitable for manuscripts
- To be tested Deskew Tools: https://galfar.vevb.net/wp/projects/deskew/
- Deskewing of PDF
- Commercial (yet affordable option): PDFxChange editor