Scan Tailor is an interactive post-processing tool for scanned pages. It performs operations such as page splitting, deskewing, adding/removing borders, and others. You give it raw scans, and you get pages ready to be printed or assembled into a PDF or DJVU file. Scanning, optical character recognition, and assembling multi-page documents are out of scope of this project.
Scan Tailor is Free Software (which is more than just freeware). It's written in C++ with Qt and released under the General Public License version 3. We develop both Windows and GNU/Linux versions.
Writes settings to the registry:
Version tested: 0.9.11 x64
Let me say that this is a brilliant application and I'll use it even if it is not portable!