It is an interactive website offering access to genome sequence data from a variety of vertebrate and invertebrate species and major model organisms, integrated with a large collection of aligned annotations. The Browser is a graphical viewer optimized to support fast interactive performance and is an open-source, web-based tool suite built on top of a MySQL database for rapid visualization, examination, and querying of the data at many levels.
A license is required for commercial download and/or installation of the Genome Browser binaries and source code.
Downloading data: http://www.genome.ucsc.edu/goldenPath/help/ftp.html
UCSC Genome Browser Mirror Sites see: https://genome.ucsc.edu/mirror.html
Simons Center for Quantitative Biology at Cold Spring Harbor Laboratory : http://genome-mirror.cshl.edu/ This mirror may contain CSHL-generated annotations in addition to the standard UCSC tracks