This is Ralf S. Engelschall's /usr/adm/ self-contained toolkit which allows easy upgrading of FreeBSD boxes for administrators which are not FreeBSD hackers. It mainly provides a simple "cd /usr/adm; make upgrade" procedure which updates /usr/{src,doc,ports} via csup(1), cvsup(1) or rsync(1), builds and installs the "world" and the kernel. The tarball can be found here.