The branches are: master: the official project AVO-version of the code-base on github release-$tag: Latest stable release running at: http://giseis.alaska.edu/AVO/avoseis/volc2/volc2/index.php (Chinook) develop: Latest bleeding edge development version, hosted at http://giseis.alaska.edu/AVO/avoseis/volc2_dev/volc2/index.php (Chinook)