Free papers
Preprints, open-access journals, literature search and institutional repositories — doors to real papers that cost nothing.
Preprints6
arXiv
No clicks yetPreprints in physics, maths and computer science
bioRxiv
No clicks yetLife science preprints
medRxiv
No clicks yetMedical and clinical preprints
SSRN
No clicks yetWorking papers in social science and law
HAL 开放档案
No clicks yetFrance's multidisciplinary open archive
OSF Preprints
No clicks yetA single door to multidisciplinary preprints
Open-access journals7
DOAJ 开放获取期刊目录
No clicks yetA vetted directory of open-access journals
plos.org
PLOS
No clicks yetA pioneer of open-access publishing
frontiersin.org
Frontiers
No clicks yetA multidisciplinary family of open-access journals
MDPI
No clicks yetAn open-access publisher with very broad coverage
Nature 开放获取
No clicks yetFree-to-read articles from Nature journals
PNAS
No clicks yetThe US national academy's interdisciplinary journal
DOAB 开放获取图书目录
No clicks yetA gateway to free scholarly monographs
Literature search11
OpenAlex
No clicks yetAn open map of the research literature
semanticscholar.org
Semantic Scholar
No clicks yetLiterature search with AI summaries
BASE
No clicks yetAn academic search engine built in Germany
CORE
No clicks yetThe largest aggregation of open-access full text
Unpaywall
No clicks yetFinds the legal free version of a paper
Europe PMC
No clicks yetA full-text database for the life sciences
pubmed.ncbi.nlm.nih.gov
PubMed
No clicks yetThe standard index for medical literature
ncbi.nlm.nih.gov
PubMed Central
No clicks yetA free full-text library in biomedicine
ERIC 教育文献库
No clicks yetThe US education department's research library
nber.org
NBER 工作论文
No clicks yetA high ground for economics working papers
openaire.eu
OpenAIRE
No clicks yetEurope's open science infrastructure
Repositories & books9
MIT 机构库
No clicks yetMIT's papers and theses
Harvard DASH
No clicks yetHarvard's open-access repository
Google Scholar
No clicks yetThe widest-reaching academic search
OpenDOAR 机构库名录
No clicks yetA worldwide directory of institutional repositories
OAPEN
No clicks yetA library of open-access scholarly books
Zenodo
No clicks yetPapers, data and code in one place
RePEc / IDEAS
No clicks yetThe master index of economics literature
美国国家经济研究局
No clicks yetA publishing platform for economic policy research
JSTOR Open
No clicks yetThe free portion of JSTOR
Regional & language portals12
中国知网
No clicks yetThe largest Chinese-language literature database
万方数据
No clicks yetChinese theses and journals
维普期刊
No clicks yetChinese science and technology journal search
国家科技报告服务系统
No clicks yetOpen Chinese science and technology reports
中国科学院文献情报中心
No clicks yetThe Chinese Academy of Sciences' library services
SciELO
No clicks yetOpen journals from Latin America and Iberia
jstage.jst.go.jp
J-STAGE
No clicks yetJapan's academic journal platform
韩国学术期刊引文索引
No clicks yetSouth Korea's official academic citation index
cyberleninka.ru
CyberLeninka
No clicks yetAn open library of Russian academic papers
Redalyc
No clicks yetAn open journal network in Spanish and Portuguese
OpenAIRE Explore
No clicks yetA search across borders in open science
ProQuest 学位论文
No clicks yetA searchable index of theses worldwide
Paper news & checks4
sciencedaily.com
ScienceDaily
No clicks yetResearch summaries from university press offices
EurekAlert!
No clicks yetA press release platform for research institutions
Phys.org
No clicks yetCoverage of physics and technology papers
retractionwatch.com
Retraction Watch
No clicks yetTracking retractions and research misconduct