asbt is a tool for managing packages in your local copy of slackbuilds, which can be obtained from http://slackbuilds.org (SBo). It supports searching (-s), viewing information (-i,-r,-d,-v,-l,-q), downloading (-G), building (-B), installing/removing/upgrading (-I,-R,-U), checking updates (-c), and some other options. The list of available options is present in the readme and the man page.