Academic Karma indexes the following preprint servers:

  • arXiv : e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance, Statistics, Electrical Engineering and Systems Science, and Economics
  • bioRxiv : The Preprint Server for Biology
  • ChinaXiv : The Preprint Server for China
  • ChemRxiv : The Preprint Server for Chemistry
  • OSF : A scholarly commons to connect the entire research cycle
  • PeerJ : Preprint server for biological, medical and environmental sciences
  • Preprints.org : The Multidisciplinary Preprint Platform
  • Social Science Research Network : SSRN is devoted to the rapid worldwide dissemination of research and is composed of a number of specialized research networks.
  • viXra : An alternative archive of 24734 e-prints in Science and Mathematics serving the whole scientific community
  • Zenodo : Research data repository

Including the following preprints provided by OSF

  • AfricArXiv : A free preprint service for African scientists
  • AgriXiv : Preprints for Agriculture and Allied Sciences
  • arabixiv : Arabic Archive for Scientific Publishing on the Internet
  • Berkeley Initiative for Transparency in the Social Sciences
  • EarthArXiv : A free preprint service for the Earth sciences
  • ECSarXiv : a free preprint service for electrochemistry and solid state science and technology
  • engrXiv : The open archive of engineering
  • Frenxiv : The French server for Preprints in all the scientific fields
  • FocUS Archive : A free preprint service for the focused ultrasound research community.
  • INARxiv : The Preprint server of Indonesia
  • LawArXiv : Legal Scholarship in the Open
  • MindRxiv : Open archive for research on mind and contemplative practices
  • NutriXiv : A free preprint service for the nutritional sciences
  • paleorxiv : A preprint archive for Paleontology
  • MarXiv : The free research repository for the ocean and marine-climate sciences
  • PsyArXiv : A free preprint service for the psychological sciences
  • SocArXiv : Open archive of the social sciences
  • SPORTRxIV : The open archive for sport, exercise, and physical activity related research
  • Thesis Commons : An open archive of Theses