DT1 1.8.2 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. DT1 for Mac is included in Audio & Video Tools.
The following version: 1.8 is the most frequently downloaded one by the program users. The most frequent installer filename for the program is: dt1v182.dmg. This app's bundle is identified as jp.ac.soka.unemi. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is an intellectual property of Tatsuo Unemi & Daniel Bisig.
From the developer:
DT1 is an interactive installation that employs flocking algorithms to produce music and visuals. The user's motions are captured by a video camera and influence the flocks behaviour. Each agent moving in a virtual 3D space controls a MIDI instrument whose playing style depends on the agent's state. In this system, the user acts as a conductor influencing the flock's musical activity.
You may want to check out more software for Mac, such as Mixtikl 5, Noatikl 2 - Generative Music Lab or LividLooper, which might be related to DT1.