Have a look at DisGeNET. It is a very well done and well supported database that aggregates and curates information from other sources. We are happy to use it in Open PHACTS (which also offers another way to access it).
"GRASP v1.0 contains >6.2 million SNP-phenotype association from among 1390 GWAS studies. The authors re-annotated GWAS results with 16 annotation sources including some rarely compared to GWAS results (e.g. RNAediting sites, lincRNAs, PTMs)."