NAPS2 is a document scanning application with a focus on simplicity and ease of use. Scan your documents from WIA- and TWAIN-compatible scanners, organize the pages as you like, and save them as PDF, TIFF, JPEG, PNG, and other file formats. Requires .NET Framework 4.0 or higher.
Visit the NAPS2 home page at www.naps2.com.
Have a look at the Developer Onboarding page.