- OpenKnowledge@NAU
- Open University of Tanzania Repository
- Open Research Online
- Ontario Climate Change Data Portal
- OCL - Oilseeds and fats, Crops and Lipids
- OceanObs`09
- Nottingham ePrints
- Northumbria Research Link
- NordForsk
- NERC Open Research Archive
- NERC Open Research Archive
- NERC Open Research Archive
- National Model United Nations
- MUSE - Museo delle Scienze
- MIT Press Journals
- Minnesota Urban Debate League
- Middlesex University Research Repository
- Maynooth University ePrints and eTheses Archive
- MATEC Web of Conferences
- Macquarie University ResearchOnline
