Indexing & Abstracting Services

• OpenAIRE
• ScienceGate
• ResearchGate
• Semantic Scholar
• Scope Database
• Academic Resource Index
• ScienceOpen
• Directory of Open Access Scholarly Resources (ROAD)
• Directory of Research Journals Indexing
• The Open Science Framework (OSF)

Journal Ranking Lists

• American Quality Centre for Journals

Digital Preservation

• Lockss
• CLOCKSS
• Internet Archive
• Internet Archive(Scholar)
• PKP Open Archives Harvester 
• Issuu
• Scribd

Content Aggregators

• Scilit
• OCLC WorldCat
• Google Scholar

Journal Directories

• SHERPA/RoMEO (Publisher Copyright Policies & Self-Archiving)
• Journals Directory

Other Directories

• ADVANCED SCIENCE INDEX
• Harvard Library
• Dimensions
• International Scientific Indexing (ISI)
• JournalTOCs
• ESJI
• ZENODO
• Root Indexing
• Cosmos
• International Institute of Organized Research
• Scientific Indexing Services
• Slides Share
• Academia.edu
• Lens
  
• MPRA
• EuroPub
• Refseek Academic Search Engine
• DOI
• Crossref Member
• Utrecht University Library
• University of Maryland Library
• Kyoto University of Library
• Ursinus College Library

Other Libraries: