Autopkg
Tool to help automate Slackware package creation. Can be used to easily create a package from a program's source.
Linux Slackware-Advocacy
Devoted to promotion of the Slackware Linux distribution.
LinuxPackages
Offers collection of packages, Howto's, user discussion forums, and rating system.
Malaysia Slackware Group
Offers help and advice written in English, and provides people around the globe with information on Slackware.
SlackFAQ - Slackware Documentation Project
Includes FAQs, tutorials, and a support forum.
slackFTP
A bootdisk that allows an install of Slackware to occur from an FTP site, using FTPFS, rather than from local media.
Slackware Help
Offers articles that help with a number of aspects of Slackware Linux.
Slackware Linux Live CD
Runs Slackware from the CDROM. Site includes features, screenshots, FAQ, and downloads.
Swaret
Alternate package manager for Slackware. Functions similarly to apt-get, the Debian package manager.
The Slackware Linux Project
The original Linux distribution, geared towards power and stability. FAQ, support, news, mailing lists, downloads, and links.