Website and database provided by the Austrian Breast & Colorectal Cancer Study Group.
http://www.abcsg.at/

Information about more than 41,000 active industry and government-sponsored clinical trials, as well as new drug therapies in research and those recently approved by the FDA.
http://www.centerwatch.com/

ClinicalTrials provides regularly updated information about federally and privately supported clinical research in human volunteers. ClinicalTrials gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details.
http://clinicaltrials.gov/

The Clinical Trials Registry- India (CTRI), hosted at the ICMRs National Institute of Medical Statistics, is a free and online public record system for registration of clinical trials being conducted in India that was launched on 20th July 2007
http://ctri.nic.in/

Clinical trials, provided by the NIH Genetic Modification Clinical Research Information System (GeMCRIS).
http://www.gemcris.od.nih.gov/Contents/GC_CT_RPT_MAKER.asp

Database, maintained by the WHO, about clinical trials.
http://apps.who.int/trialsearch/

The ISRCTN is a simple numeric system for the identification of randomised controlled clinical trials worldwide. The ISRCTN Register will also accept registration of other forms of studies designed to assess the efficacy of healthcare interventions. The ISRCTN scheme simplifies the identification of trials and provides a unique number that can be used to track all publications and reports resulting from each trial.
http://www.isrctn.com/

NCI-supported clinical trials are those sponsored or otherwise financially supported by NCI.
https://www.cancer.gov/about-cancer/treatment/clinical-trials/search

This website can be used to cross-search the content of three national clinical research information registries: The University Hospital Medical Information Network Center (UMIN-CTR), The Japan Medical Association Center (JMACCT), The Japan Pharmaceutical Information Center (JAPIC).
http://rctportal.niph.go.jp/en/

Clinical Trials by Novartis.
https://www.novartisclinicaltrials.com/