TrunAPP 4.5.5 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. TrunAPP for Mac relates to Design & Photo Tools. We recommend checking the downloaded files with any free antivirus. This free Mac application is an intellectual property of TrunCAD GmbH.
From the developer:
TrunAPP helps you design your furniture the way you want. Thus, you can create furniture for your wardrobe, kitchen, bathroom, office, sliding doors, living room, sideboards, just as you wish and how it meets your needs best. You can use a photo as background and see immediately how it fits in your room.
You may want to check out more Mac applications, such as Smith Chart for Mac, Movie2Shot or TVPaint Animation, which might be similar to TrunAPP.