Sumatra PDF might be a bit more popular than GNU Health. We know about 1 link to it since March 2021 and only 1 link to GNU Health. 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.
GNU Health (https://gnuhealth.org) has been around for some time and is in active development. Most of the deployments are outside the US though. Source: almost 2 years ago
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
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
OpenEMR - OpenEMR is an open source electronic health records and medical practice management solution.
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.
drchrono - An EHR built for your specialty:
Okular - Okular is a universal document viewer based developed by KDE.