Slackware remains kicking after 21 years of guidance by its leader Patrick Volkerding. The most recent release of Slackware is version 14.1 that took place late last year with the Linux 3.10 kernel -- a long way from the initial Slackware 1.00 release that used the pre-1.0 Linux kernel (0.99.11).
You can try out the latest Slackware Linux release at Slackware.com.
According to Patrick Volkerding's Tweet, Slackware's 21st birthday (the legal drinking age in the USA) was celebrating by doing a PBR beer bong on a Slackware CD.
Tonight's Phoronix beer of choice for celebrating Slackware turning 21 is not PBR but rather the always-delicious Kloster Andechs Weissbier Hell. Happy Birthday Slackware!