This database contains information on familial hypertrophic cardiomyopathy (FHC)-associated mutations and related data.
http://www.angis.org.au/Databases/Heart/heartbreak.html

CardioSignal was designed for integration of regulatory information on the transcriptional regulation involved in heart development and cardiac hypertrophy.
http://www.cardiosignal.org/

This database is a repository of the genetic variations identified and published in the field of inherited arrhythmogenic diseases and cardiac ion channels.
http://www.fsm.it/cardmoc/

The Heart and Calcium functional Network (HCNet) database is a collection of functional gene modules calculated from the microarray data compendium available from the GEO database. It is a specialized database designed to assist experimentalists for cardiac calcium signaling research by providing the pre-calculated gene clusters and their potential correlation network in heart.
http://sbrg2.gist.ac.kr/hcnet/

Heart and Calcium functional Network (HCNet) is a specialized database for mouse heart and calcium signaling toolkit genes. It contains the functional gene modules pre-calculated from the microarray data compendium using various algorithms for genetic network analyses. First of all, it could relieve the burden of wet-scientists in the related fields from the complex and tedious analyses of the high-throughput genetic data. Eventually, it will serve as a good vehicle for setting up an interesting hypothesis by reviewing the dynamic compilation of functional genetic modules.
http://sbrg2.gist.ac.kr/hcnet/

Database of drugs that prolong the Qt interval
http://www.qtdrugs.org

Mutations in sarcomere protein genes are known to cause hypertrophic cardiomyopathy, dilated cardiomyopathy, and other diseases.
http://www.gen2phen.org/content/sarcomere-protein-gene-mutation-database