DBScan certainly is. But not sure about a FOSS implementation... http://www.sciencedirect.com/science/article/pii/S1877050913003438 http://www.sciencedirect.co

DBScan certainly is. But not sure about a FOSS implementation... http://www.sciencedirect.com/science/article/pii/S1877050913003438 http://www.sciencedirect.com/science/article/pii/S1877050913... https://www.researchgate.net/publication/221614133_Density-based_clustering_using_graphics_processors&ved=0ahUKEwiEitLFipfOAhWMcRQKHemLAQ8QFggbMAA&usg=AFQjCNFi5JF-BuT8Z0fZaQa-GlrbjB31tg&sig2=nZcg_5Gp2f1ao-nJJM4ypQ https://www.researchgate.net/publication/221614133_Density-b...