Installing software depends on the quality of your package manager. Otherwise you do it the same way, typically with the GNU build system. The ports tree is t

Installing software depends on the quality of your package manager. Otherwise you do it the same way, typically with the GNU build system. The ports tree is the most natural form of package management I've used. Then, if you prefer binaries, you have pkgng and the pkg_install utility. This is for FreeBSD, at least.