ProWeave 7.0 for Mac is available as a free download on our application library. The software lies within Design & Photo Tools, more precisely Viewers & Editors. This Mac app was originally developed by proweave.
From the developer:
ProWeave is a weaving design software tool for Macintosh. ProWeave for Macintosh provides a complete set of tools for everyone from the beginning weaver to professional artists. You can open multiple work spaces with multiple drafts in each work space, and also fill with repeat for easy completion of threadings, tie-ups and treadlings.
You may want to check out more software for Mac, such as OnTheAirCGServer, ASCIIsee or QuickShow OSX, which might be similar to ProWeave.