Most of the public SSR markers can be retrieved from the Probe database at NCBI.
A first genome wide SNP discovery project was carried out: Myles S, Chia J-M, Hurwitz B, Simon C, Zhong GY, Buckler E, Ware D (2010) Rapid Genomic Characterization of the Genus Vitis. PLOS ONE , 5: e8219
Recently a dataset, comprising 10207 SNPs for 783 grape cultivars and without missing data, is made available in support of the paper "Laucou V, Launay A, Bacilieri R, Lacombe T, Adam-Blondon AF, Bérard A, Brunel D, Chauveau A, Ibañez J, Le Paslier MC, Maghradze D, Martinez-Zapater JM, Maul E, Töpfer R, Péros JP, Boursiquot JM, 2018. Extended Diversity Analysis of Cultivated GrapevineVitis vinifera with 10K genome-wide SNPs. PlosOne, 13, 2 : e0192540.