| Budapest Open Access |
| COAR (Confederation of Open Access Repositories) |
| Cornell University Library ArXiv.org |
| DE GRUYTER |
| DOAJ (Directory of Open Access Journals) |
| DOAB (Directory of Open Access Books) |
| DRIVER (Digital Repository Infrastructure Vision for European Research) |
| DSpace |
| EIFL (Electronic Information for Libraries) |
| E-Print Network |
| E-Prints |
| EOS (EnablingOpenScholarship) |
| FindArticles |
| Free eBooks by Project Gutenberg |
| Free Full PDF |
| Google Scholar |
| International Scientific Publications |
| MedOANet |
| OAI (Open Archives Initiative) |
| OASIS (Open Access Scholarly Information Sourcebook) |
| OpenAIRE |
| Open Access Map |
| Open Access Textbooks Project |
| Open Access Week |
| Open Educational Resources-UNESCO |
| Ranking Web of Repositories |
| Sciense Dissemination Unit |
| SciELO (Scientific Electronic Library Online) |
| SOCIAL SCIENCE RESEARCH NETWORK |
| Springer Open |
| The Directory of Open Access Repositories-OpenDOAR |
| Wiley Open Access |
