Digital Commons: Offers access to journals and primary materials held in repositories around the world.
CORE:A collection of open access research papers from around the world that aggregates open access research outputs from repositories and journals worldwide.
Academia: A platform for sharing academic research.
EthOS: Operated by the British Library, this site searches nearly half a million doctoral theses across a variety of disciplines.
ScienceOpen: A research and publishing network with a commitment to open science knowledge.
arXiv.org:An open access archive for scholarly articles in physics, mathematics, computer science, and quantitative fields.
Public Library of Science: Publishes research from more than 200 disciplines in the sciences and open access journals covering science and medicine fields.
dblp computer science bibliography: Provides open bibliographic information on computer science journals. Search for full text only allows access to the work as some titles not available in full text may be behind a paywall.
JURN: A multidisciplinary search engine offering links to scholarly websites, article and journals that are open to access.
paperity: A multipdisciplinary aggregator of open access journals and papers covering the sciences fields.