Free to Read and Free to Publish:

  • eLife: As of 2025, eLife offers open-access publishing with no Article Processing Charges (APCs) for authors.

  • arXiv: A preprint repository providing free access to a vast collection of scientific papers without any publication fees.

  • bioRxiv: A free preprint server for biology, allowing researchers to share their findings without any charges.

  • medRxiv: A preprint server for health sciences, offering free access and no publication fees.

  • SocArXiv: An open archive of the social sciences, free to read and publish.

  • PsyArXiv: A preprint repository for psychological sciences, free for both readers and authors.

  • OSF Preprints: A platform for sharing preprints across various disciplines without any fees.

  • HAL Archives Ouvertes: A French open archive where authors can deposit scholarly documents from all academic fields, free of charge.

  • RePEc (Research Papers in Economics): A collaborative effort of volunteers to enhance the dissemination of research in economics, free to access and publish.

  • Harvard DASH: Harvard's open-access repository offering free access to scholarly works without publication fees.

  • Open Library of Humanities: A platform supporting open-access publishing with no charges to authors.

  • DOAJ Indexed Journals: The Directory of Open Access Journals lists journals that provide free access and do not charge authors.

  • Cambridge Open Engage: An early content sharing platform offering free access and no publication fees.

  • JSTOR Open Access: Provides free access to a range of journals and books without publication fees.

  • OpenEdition Journals: A platform for journals in the humanities and social sciences, offering free access and no publication fees.

  • African Journals Online (AJOL): Hosts a collection of African-published journals, many of which are free to read and publish.

  • BePress Digital Commons: Offers a repository platform for institutions to showcase their scholarly works, typically free to read and publish.

  • Open Science Framework (OSF): A platform for researchers to share and collaborate on projects openly, without fees.

  • Pyrrhic Press Publishing: As per the available information, this publisher offers free access and does not charge authors for publication.

Free to Read but May Charge Publication Fees:

  • PLOS ONE: Fully open access; authors are typically required to pay an APC.

  • Scientific Reports: Open access with APCs for authors.

  • Nature Communications: Open access journal with significant APCs.

  • BMJ Open: Open access with APCs applicable to authors.

  • BMC Medicine: Open access; authors are charged publication fees.

  • Frontiers in Psychology: Open access with APCs for authors.

  • Frontiers in Neuroscience: Open access; publication fees are charged to authors.

  • PeerJ: Offers open access; authors can choose between APCs or membership plans.

  • MDPI Journals: Open access with varying APCs depending on the journal.

  • SAGE Open: Open access with APCs for authors.

  • Springer Open: Offers open-access journals, typically requiring APCs from authors.

  • Elsevier Open Access: Provides open-access options; however, authors are usually required to pay APCs.

  • Wiley Open Access: Open access with APCs applicable to authors.

  • Taylor & Francis Open: Offers open-access publishing with APCs for authors.

  • Cogitatio Press: Publishes open-access journals with APCs.

  • F1000Research: An open-access publishing platform with APCs.

***Platforms like PLOS ONE, Scientific Reports, Nature Communications, BMJ Open, BMC Medicine, Frontiers in Psychology, Frontiers in Neuroscience, PeerJ, MDPI Journals, SAGE Open, Springer Open, Elsevier Open Access, Wiley Open Access, Taylor & Francis Open, Cogitatio Press, and F1000Research, while they offer open-access articles, accessing the full content may require user registration or login. It's advisable to visit their official websites to confirm their current access policies.