Genetics Home Reference is the National Library of Medicine's website for consumer information about genetic conditions and the genes or chromosomes related to those conditions.
As of October 1, 2020, the genetics content will no longer be available at this website, but will be relocated to the Genetics section of Medline Plus - https://medlineplus.gov/genetics/
MedGen is the NCBI's portal to information about human disorders and other phenotypes having a genetic component. It contains a clearly defined set of concepts and terms for each phenotype including clinical findings, causative genetic variants, available clinical and research tests, molecular resources, professional guidelines, original and review literature, consumer resources, clinical trials, and links to other related resources.
This open access database is an online catalog of human genes and genetic phenotypes that is updated daily. OMIM is authored and edited at the McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine.