NttCAD is described as ': free, simple 2D/3D CAD software, multi-platform (works on Windows, Mac, linux...). Programmable in Java language. Small program size and fast download. Saves in autocad dxf, svg and NttCAD formats'. There are more than 25 alternatives to NttCAD for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and PortableApps.com. The best alternative is LibreCAD, which is both free and Open Source. Other great apps like NttCAD are DraftSight (Paid), BricsCAD (Paid), nanoCAD (Paid) and CMS IntelliCAD (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.
DraftSight is a professional-grade, open 2D CAD product for users who want a better way to read, write and share DWG files. DraftSight is easy to use and is available for professional CAD users, students and educators to download and activate for free.
BricsCAD the first all-in-one CAD design solution in .dwg that answers all your needs; 2D drafting, 3D modeling, mechanical design, and BIM. BricsCAD is a cost-effective, innovative, and familiar CAD solution.
nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability. It is totally free, for business, professional, or personal purposes. It is fast, lightweight, capable, and , unlike most free CAD programs, completely uncrippled. nanoCAD includes:
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.
The product fully complies to current market standards as regards office automation software and design. The user interface, compatible with Office 2000 ® is a simple and friendly work environment that allows you to be up and running quickly.