You could have downloaded DesignFreeQ 2.18 for Mac from our application library for free. Our antivirus analysis shows that this Mac download is virus free. The software relates to Design & Photo Tools. The actual developer of this free software for Mac is Shark Designer.
From the developer:
DesignFreeQ drafting program is used in CAD/CAM to produce high precision drawings, but also in areas like technical illustration, documentation and education. Due to DesignFreeQ’s unique Inference Engine, drafting is made as easy as sketching on a piece of paper. The user interface is minimalistic but incredibly powerful and intuitive. Even novice users can quickly create precise drawings in both 2D and 3D.
You may want to check out more software for Mac, such as eBPMN, topCAD or Opera SVG Viewer, which might be similar to DesignFreeQ.