High Design is described as 'HighDesign is the modern, easy-to-use 2D CAD and illustration solution that raises your productivity standards by providing new concepts and powerful tools in a friendly environment' and is a CAD Software in the Photos & Graphics category. There are four alternatives to High Design for a variety of platforms, including Windows, Mac, Online / Web-based, PortableApps.com and SaaS. The best alternative is LibreCAD, which is both free and Open Source. Other great apps like High Design are CMS IntelliCAD (Paid), Punch! ViaCAD 2D (Paid) and Dock Designer (Paid).
LibreCAD (originally QCad then CADuntu) is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.
CMS IntelliCAD® is a full-featured Compatible CAD Software. CMS IntelliCAD also offers a full suite of 2D and 3D AutoCAD® software compatible drawing tools! It is the smartest choice for anyone who creates or communicates using CAD drawings.
Customized to the specific building rules of dock building companies, Dock Designer enables visual design in 2D where you can see your dock design in 3D and have instant access to accurate estimates, parts lists, blueprints, and much more.