The TRIP database
Turning Research Into Practice. Provides rapid access to a wide range of reliable, clinically relevant and robust sources of evidence about medicines from around the world. Access by subscription, but non-subscribers to the TRIP database are allowed five free searches. Free to low-income countries.
Database of Essential Information on Therapeutics (in Spanish)
The Health InterNetwork Access to Research Initiative (HINARI) provides free or very low cost online access to the major journals in biomedical and related social sciences to local, non-profit institutions in developing countries.