"Slackware programmers are often from private sector developers and large technology companies,"
Since its first beta release in April of 1993, the Slackware Linux Project has aimed at producing the most "UNIX-like" Linux distribution out there. Slackware complies with the published Linux standards, such as the Linux File System Standard. We have always considered simplicity and stability paramount, and as a result Slackware has become one of the most popular, stable, and friendly distributions available.
The name "Slackware" stems from the fact that the distribution started as a private side project with no intended commitment. To prevent it from being taken too seriously at first, Volkerding gave it a humorous name, which stuck even after Slackware became a serious project.
Advantages of Slackware: speed, great configuration options and stability, neutrality and safety. It is especially amazing for running big servers. For many serious open source advocates, Slackware is going to be the most obvious choice. Slackware has been around for 20 years now