OBLISK (Open Binary Linux Install System Kit) aims to make any package install on any modern GNU/Linux system. OBLISK packages are sent in an appdir-like package and can be run entirely in place, but also have an installer, which makes it possible for them to be installed to /usr or any other path.
Slackpkg is an automated package-management tool for Slackware Linux. It can do tasks such as automatic downloading and installing or upgrading, browse the MANIFEST.gz (Slackware package-contents guide), and more. Dependencies are not automatically handled. It is not a replacement for pkgtool, but a valuable add-on.