More and more DE (Desktop Environment) and WM (Window Manager) that are available as options to users thanks to the open source environment. Users are not bound to certain DE/WM since they can easily install others either by using pre-compiled binaries provided by the packagers or build it manually using SlackBuild script available (either via SlackBuilds or third party projects).
On the latest poll, i listed some DE/WM that you wish it will be included in the future Slackware releases. There are no guarantees that your wish will come true as Patrick is the final decision maker on what packages included in Slackware, but it should be fun to know which DE/WM that people are interested with.
Go votes :)