Downloading MOTIF XS Editor 1.3 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Audio & Video Tools, more precisely Editors & Converters. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is Yamaha.
From the developer:
MOTIF XS Editor is a convenient tool which lets you edit and save the various parameters of your MOTIF XS synthesizer.
You may want to check out more software for Mac, such as Motif Waveform Editor, MOTIF XF Editor or Motif ES Drum Kit Editor, which might be related to MOTIF XS Editor.