Simple Scan might be a bit more popular than Sumatra PDF. We know about 1 link to it since March 2021 and only 1 link to Sumatra PDF. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can use your browser for both, there are extensions(FireFox - PDF & EPUB/Chrome - PDF& EPUB) for that. In case, you want you use a separate software for them, I suggest SumatraPDF--it handles both PDFs and .EPUB files. Source: over 1 year ago
I really like https://launchpad.net/simple-scan. Source: over 2 years ago
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
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.
VueScan - Third-party software for film scanners and flatbed scanners.
Okular - Okular is a universal document viewer based developed by KDE.
XSane - A good proposal for SANE-2 has been written.