ClinicalTrials.gov
This is an initiative of the U.S. National Institutes of Health and is a registry and results database of publicly and privately supported clinical studies of human participants conducted around the world.
Clinical Trials Registry-India (CTRI)
The Clinical Trials Registry- India (CTRI), hosted at the ICMR-National Institute of Medical Statistics (NIMS), is a free and online public record system for registration of clinical trials being conducted in India that was launched on 20th July 2007.