FUMA is a web-based platform that can be used to annotate, prioritize, visualize and interpret GWAS results. It requires you to upload GWAS summary statistics under your own account, and FUMA will then apply an extensive range of functional SNP annotations and gene-mapping.

For more information see the FUMA site or the publication:
Watanabe, K., Taskesen, E., van Bochoven, A., & Posthuma, D. (2017). Functional mapping and annotation of genetic associations with FUMA. Nature communications, 8(1), 1826. https://doi.org/10.1038/s41467-017-01261-5