Open access to 1,541,333 e-prints in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. Submissions to arXiv should conform to Cornell University academic standards. arXiv is owned and operated by Cornell University, a private not-for-profit educational institution.
Access to Scopus was discontinued in January 2022. Please use Web of Science instead.
"bioRxiv (pronounced "bio-archive") is a free online archive and distribution service for unpublished preprints in the life sciences. It is operated by Cold Spring Harbor Laboratory..." Started in November of 2013, the archive has a limited number of articles at this time.
"Serves as the largest central resource for government-funded scientific, technical, engineering, and business related information. For more than 60 years, NTIS has assured access to approximately 3 million publications covering over 350 subject areas."
"Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. You can also learn about breakthroughs in your field and comment on new discoveries."
"Searches over 50 databases and over 2100 selected websites from 12 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results."
SSRN is an open-access online preprint community providing valuable services to leading academic schools and government institutions. Specializing primarily in social sciences, including economics, law, corporate governance, and humanities, SSRN is branching out in to other science disciplines providing opportunities for scholars to post their early research, collaborate on theories and discoveries, and get credit for their ideas before peer reviewed publication.