Deck is among the earliest pieces of non-linear digital audio editing workstation software available for the Mac. It can be used to edit and arrange regions of audio on multiple tracks and control fades and volume and pan automation.

Digital Performer 2 is a MIDI music composing application suite, with all kinds of audio plugins to assist you.  Version 2.3 was released in January 1998.  Version 2.7.2 was released in May 2000. See also: Digital Performer 3.0  

DrDJ is a very simplistic sound mixing application.  It lets you play and cross fade tracks automatically.  It lets you adjust both tracks volume independantly and queue up to 20 tracks.  

DJ-1800 is an application that emulates the Denon DN-1800F professional CD Player system used by many DJs and radio stations. It allows the end user to play audio files via an interface that resembles a professional DJ-standard CD player.

Disc-to-Disk is an audio capture software program that allows recording of CD Audio content onto a hard disk, perfect for preparing audio for creation of a CD Audio disc. Tracks can be captured in batch mode in a variety of different formats and...