pport1 is a set of drivers which support the Intelogis PassPort networking product. The Intelogis PassPort is a parallel port adapter which sends data and control network traffic over common power lines. These drivers currently only work with Linux kernel version 2.0.
rslink is a GTK application that controls mutliple Sony 200-disc changers via the S-Link port. The current version is designed to work with the nirvis SLink-E unit. It will automatically scan the CDs for title information in the CDDB, and allow you to create playlists.
This is a driver for SCSI Medium Changer devices, which are listed with "Type: Medium Changer" in /proc/scsi/scsi. This is for large scale Jukebox systems, not for smaller common CD_ROM changers or IDE drives.