UCSC Browser: This site contains the reference sequence and working draft assemblies for a large collection of genomes.[26] Ensembl: The Ensembl project produces genome databases for vertebrates and other eukaryotic species, and makes this information freely available online.[27] MapView: The Map Viewer provides a wide variety of genome mapping and sequencing data.[28] VISTA is a comprehensive suite of programs and databases for comparative analysis of genomic sequences. It was built to visualize the results of comparative analysis based on DNA alignments. The presentation of comparative data generated by VISTA can easily suit both small and large scale of data.[29] BlueJay Genome Browser: a stand-alone visualization tool for the multi-scale viewing of annotated genomes and other genomic elements.[30]