OAPEN is described as 'Promotes and supports the transition to open access for academic books by providing open infrastructure services to stakeholders in scholarly communication. We work with publishers to build a quality-controlled collection of open access books and provide services for' and is an website in the education & reference category. There are three alternatives to OAPEN, not only websites but also apps for. The best OAPEN alternative is Internet Archive, which is free. Other great sites and apps similar to OAPEN are arXiv and PaperLens.
The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, it provides free access to researchers, historians, scholars, the print disabled, and the general public.
Internet Archive is the most popular Web-based alternative to OAPEN.
Internet Archive is the most popular free alternative to OAPEN.
arXiv® is a free distribution service and an open archive for scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.
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