Slackware is described as 'Linux is an advanced Linux operating system, designed with the twin goals of ease of use and stability as top priorities. Including the latest popular software while retaining a sense of tradition, providing simplicity and ease of use alongside flexibility and power' and is a popular Linux Distro in the os & utilities category. There are more than 100 alternatives to Slackware for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best Slackware alternative is Linux Mint, which is both free and Open Source. Other great apps like Slackware are Ubuntu, Debian, Fedora and Arch Linux.
Gentoo has powerful dependency resolution among other things.