Slackware is the oldest linux distro alive. It was first released on 1993.When installing you can choose from basic packages to major packages according to your needs w You have to configure thing with text editors here not fancy graphics. It is a community distro.
There's no support official.
This is a favourite with old timers and Unix lovers.
Of course it is better known for running in minimal hardware not supported by any other major distro.
You have to take software from source forge.net. It was made from SLS or you can say it was forked from it after Patrick was asked to remove his version of SLS having bug removed.As the new things are made they are put into the tree of distribution.
Its stable release is Slackware 13.0 having KDE 4.2.4. For latest release you can use current release with bleeding edge softwares.