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![]() I worked with AutoCAD briefly in grad school, so when I wanted to play with drawing three-dimensional plans for something, it was pretty much all I knew. Whether it has all of the bells and whistles of the original is irrelevant if those features sit paid for but unused.My personal journey through open source CAD programs was no different. The situation is no different than discovering that the person who insists that they "need" Photoshop is just using it to draw a few geometric shapes and remove red-eye from photos what they really need is a graphics editing tool that can replace those specific functions. But I would argue that the reason for your disappointment has nothing to do with the licensing of the product—drop-in replacements for complex programs with long-time users who have specific needs and expectations for their software are hard.The trick for deciding whether a replacement piece of software, whether open or closed, is a good choice for you is to tease out exactly what your needs are. Its geometry editor can import STEP, BREP, IGES, STL, and XAO files, and its mesh editor can import UNIV, MED, GGNS, SAUV, and more. SALOME integrates a CAD and CAE modeling tool with industrial meshing algorithms and advanced 3D visualization. It's a side-project of the 3D powerhouse, OpenCascade, and has some serious industrial users. And for the relatively simple task of planning out my home landscaping projects, Sweet Home 3D has been an excellent open source alternative.If your needs are a little more specific and you really need a dedicated CAD program, here are great open source choices to consider: SALOMEThe SALOME platform is an application and framework suitable for industrial design and simulation. Autocad Review 2016 Code On SourceForgeFreeCAD is written primarily in C++, and if you're a Python coder you'll want to take advantage of the ability to extend and automate FreeCAD using its Python interface.FreeCAD can import and export from a variety of common formats for 3D objects, and its modular architecture makes it easy to extend the basic functionality with various plugins. FreeCADFreeCAD is a parametric open source CAD program that was created to be able to design "real-life objects of any size," and although it's clear that many of the showcased examples created by users are smaller objects, there's no specific reason it couldn't be used for architectural applications as well. Not all parts are under the same license, with licenses ranging from BSD to LGPL to simple public domain the COPYING file within the project's source code on SourceForge has more details. In fact, BRL-CAD is so old that it has been credited with being the oldest source code repository of an application currently in active development.Originally developed by Mike Muuss at the Army Research Laboratory, BRL-CAD is been used for decades by the United States military for modeling weapon systems, but it also has been used for much more everyday design tasks, from academic to industrial design to health applications.So what does more than 35 years of development bring you? BRL-CAD is made up of more than 400 different constituent tools and applications spread across more than a million lines of source code. You have direct access to the code base.BRL-CAD is a cross-platform CAD tool that dates back to 1979, although it would take 25 years for the source code to be released under an open source license. Other good choices that are worth your time to check out include: LibreCAD is 2D only, though, so it makes more sense if your intended use is a site plan or something similarly, err, flat.LibreCAD is licensed under the GPL and you can find its complete source code on GitHub.These aren't the only options. A fork of QCAD (mentioned below), LibreCAD has an interface that will look familiar to AutoCAD users, and by default it uses the AutoCAD DXF format for importing and saving, though it can use other formats as well. LibreCADLibreCAD is another CAD program that is designed to work across Windows, Mac, and Linux alike. Currently in beta, FreeCAD is being actively developed with regular releases, but the developers warn that it may not yet be suitable for production use.FreeCAD's source code is hosted on GitHub and is made available as open source under an LGPL license. Fix a core keygen on macBoth are JavaScript-based 2D and 3D modeling tools that run in the browser and are made available under the MIT license.Since we can't include all of the options here, if you have a favorite, let us know in the comments below.Are you interested in reading more articles like this? Sign up for our weekly email newsletter. OpenJSCAD.org, which is an updated frontend for OpenJsCad. SolveSpace, which is a parametric two- and three-dimensional CAD program. QCAD, which is cross-platform but limited to two-dimensional applications.
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