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.
See README.Slackware for more information.