SymmetryWorks 6.0 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. SymmetryWorks for Mac lies within Design & Photo Tools, more precisely General. 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.
From the developer:
SymmetryWorks is a plug-in for making repeat patterns in Adobe Illustrator. Whether you are an experienced professional or a student, SymmetryWorks empowers you to create pattern designs a hundred times faster, better, and more imaginatively--like NO other software does.