OPEN REGISTRY OF PERIODICAL PUBLICATIONS
- Directory of Open Access Journals (DOAJ)
- RePEc services – research in economics and related sciences.
- ElectronicJournalsLibrary (EZB) – open access journals in English and German. Cover different knowledge areas.
- Open Journal Systems - PKP – an initiative of several universities that develops (free) open-source software and conducts research to improve the quality and reach of scientific publications.
- HighWire Press – the largest free-access archive of full-text articles.
- Arxiv - http://arxiv.org – open access to electronic documents in physics, mathematics, computer science, biology, finance and statistics
- Journal of entrepreneurship, management and innovation (Jemi)
- ABC - Chemistry: catalog of free, full-text chemistry journals
- AASRC Journal Systems - American Academic & Scholarly Research Journal (AASRJ). A multidisciplinary, peer-reviewed online open access journal. Covers computer science, engineering, social science, natural sciences, humanities.
- ADS (Astrophysics Data System, Digital Library for Physics and Astronomy) – contains more than eight million papers on astronomy and physics from both peer-reviewed and non-peer-reviewed sources. Abstracts are freely available online for almost all articles.