Here are some online knowledge bases that may be useful.
General resources
Public Health Genomics Knowledge Base (v1.0)
https://phgkb.cdc.gov/GAPPKB/phgHome.do?action=about
Genotype/Phenotype
Phenopedia
Enter phenotype and identify genetic/genomic relationships
https://phgkb.cdc.gov/HuGENavigator/startPagePhenoPedia.do
Genopedia
Enter a gene name to get references about phenotypes
https://phgkb.cdc.gov/HuGENavigator/startPagePedia.do
Variants
Characterization of variants
http://www.ncbi.nlm.nih.gov/clinvar/
Genetic Tests
Genetic Test Registry
http://www.ncbi.nlm.nih.gov/gtr/