STEM Open Access Services

Selected STEM Open Access Services
https://ieeexplore.ieee.org/Xplore/home.jsp
The Institute of Electrical and Electronics Engineers (IEEE) is the world's largest technical professional society. The technical objectives of the IEEE focus on advancing the theory and practice of electrical, electronics and computer engineering and computer science.
.
https://www.nature.com/siteindex
As part of the Nature Portfolio, Nature has spent the last 150 years championing and supporting scientific work through open scientific journals.
Advancing Open Science for more than 25 years and supporting academic communities since 1996.
https://www.springeropen.com/journals
The SpringerOpen portfolio has grown tremendously since its launch in 2010, so that it now offer researchers from all areas of science, technology, medicine, the humanities and social sciences a place to publish open access in journals.
arXiv is a free distribution service and an open-access archive for nearly 2.4 million scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. Materials on this site are not peer-reviewed by arXiv.