OpenJsCad.org is a more up-to-date OpenJsCAD frontend where you can edit .jscad files either locally or online via JS editor (built-in). A few functions are available to make the transition from OpenSCAD to OpenJSCAD easier (scad-api built-in), as well CLI (command-line interface) for server-side computations with NodeJS.And then access the contents via the URL of the web-site.

OpenJsCad.org is a more up-to-date OpenJsCAD frontend where you can edit .jscad files either locally or online via JS editor (built-in). A few functions are available to make the transition from OpenSCAD to OpenJSCAD easier (scad-api built-in), as well CLI (command-line interface) for server-side computations with NodeJS.

OpenJSCAD - Set of modular, browser and command line tools for creating parametric 2D & 3D designs with Javascript

BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering amp; geometric analyses, network distributed framebuffer support, image & signal-processing tools.
 
BRL-CAD supports a wide variety of geometric representations, including an extensive set of traditional implicit "primitive shapes" (such as boxes, ellipsoids, cones, and tori) as well as explicit primitives made from collections of uniform B-spline surfaces, non-uniform rational B-spline (NURBS) surfaces, n-manifold geometry (NMG), and purely faceted polygonal mesh geometry. All geometric objects may be combined using boolean set-theoretic CSG operations such as union, intersection and difference.

BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering amp; geometric analyses, network distributed framebuffer support, image & signal-processing tools.

BRL-CAD - Solid Modeling System

FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. FreeCAD is based on OpenCASCADE, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API.

FreeCAD - An Open Source parametric 3D CAD modeler

Archimedes is a free and open source CAD (Computer Aided Design) software. It is a robust system built over Eclipse's Rich Client Platform fully based on plug ins. This means it is easily extensible but also has a pretty thin core that allows you to select the features you need and drop the other ones easily. 

Archimedes: The open CAD

OpenSCAD is software for creating solid 3D CAD models. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies.
 
OpenSCAD is not an interactive modeller. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters.
 
OpenSCAD provides two main modelling techniques: First there is constructive solid geometry (aka CSG) and second there is extrusion of 2D outlines. Autocad DXF files can be used as the data exchange format for such 2D outlines. In addition to 2D paths for extrusion it is also possible to read design parameters from DXF files. Besides DXF files OpenSCAD can read and create 3D models in the STL and OFF file formats.

OpenSCAD is software for creating solid 3D CAD models. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies.

Openscad - The Programmers Solid 3D CAD Modeller

ImplicitCAD is a programmatic CAD program, implemented in haskell. Unlike traditional CAD programs, programmatic CAD programs use text descriptions of objects, as in programming. Concepts like variables, control structures and abstraction are used, just as in programming. Generally, objects in programmatic CAD are built with Constructive Solid Geometry or CSG. Unions, intersections and differences of simpler shapes slowly build the object. ImplicitCAD supports all this and much more.

ImplicitCAD - A math-inspired CAD program in haskell. CSG, bevels, and shells; 2D & 3D; gcode generation

QCAD is an application for computer aided drafting in two dimensions (2d). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams. 
Its features include: 
<ul>
<li>Layers</li>
<li>Blocks (grouping)</li>
<li>35 CAD fonts included</li>
<li>Support for TrueType fonts</li>
<li>Various Metrical and Imperial units</li>
<li>DXF and DWG input and output</li>
<li>Printing to scale</li>
<li>Printing on multiple pages</li>
<li>Over 40 construction tools</li>
<li>Over 20 modification tools</li>
<li>Construction and modification of points, lines, arcs, circles, ellipses, splines, polylines, texts, dimensions, hatches, fills, raster images</li>
<li>Various powerful entity selection tools</li>
<li>Object snaps</li>
<li>Measuring tools</li>
<li>Part library with over 4800 CAD parts</li>
<li>Very complete and extremely powerful ECMAScript scripting interface</li>
</ul>

QCAD is an application for computer aided drafting in two dimensions (2d). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams. 

QCAD - Crossplatform CAD Solution

LibreCAD is a comprehensive, 2D CAD application based on the community edition of QCad. It is available in more than 20 languages. LibreCAD has been re-structured and ported to qt4 and works natively cross platform between OSX, Windows and Linux.

Librecad - Open Source 2D-CAD

PYLEECAN project provides a user-friendly, unified, flexible simulation framework for the multiphysic design and optimization of electrical machines and drives. The main objective of PYLEECAN is to boost reproducible research and open-science in electrical engineering. Thus, it is intended for researchers, R&D engineers and teachers in electrical engineering, both on standard and novel topologies of electrical machines. 
 
<ul>
<li>PYLEECAN is fully coupled to <a href="http://www.femm.info/" rel="nofollow">FEMM</a> to carry non-linear magnetostatic analysis including sliding band and symmetries. For now this coupling is available (only on Windows OS).</li>
<li>PYLEECAN includes an iron losses model (based on FEMM coupling output).</li>
<li>PYLEECAN includes an electrical model to solve the equivalent circuit of PMSM and SCIM machines.</li>
<li>PYLEECAN is coupled to <a href="http://gmsh.info/" rel="nofollow">GMSH</a> 2D/3D finite element mesh generator to run third-party multiphysic solvers.</li>
<li>PYLEECAN is coupled to a multiobjective optimization library to carry design optimization of electrical machines.</li>
<li>PYLEECAN enables to define Parameter Sweep of variable speed simulations.</li><li>PYLEECAN includes a Graphical User Interface to define main 2D radial flux topologies parametrized geometries (SPMSM, IPMSM, SCIM, DFIM, WRSM, SRM, SynRM) including material library.</li>
<li>Possibility to import Slot or Hole from DXF files</li>
<li>Star of Slot Winding (with <a href="https://swat-em.readthedocs.io/en/latest/" rel="nofollow">swat-em</a>) and User Defined Winding</li>
<li>Generic Geometry modeler to draw complex machines in the software coupled with PYLEECAN</li>
<li>Notches (Yoke and Bore) / Uneven Bore shape (Lamination without slot only) / Machine with more than 2 laminations</li></ul>

PYLEECAN project provides a user-friendly, unified, flexible simulation framework for the multiphysic design and optimization of electrical machines and drives. The main objective of PYLEECAN is to boost reproducible research and open-science in electrical engineering. Thus, it is intended for researchers, R&D engineers and teachers in electrical engineering, both on standard and novel topologies of electrical machines. 

PYLEECAN - Electrical engineering open-source software providing a user-friendly, unified, flexible simulation framework for the multiphysic design and optimization of electrical machines and drives

LibrePCB is a free EDA software to develop printed circuit boards. It is all-In-One: project management + library/schematic/board editors. It has very powerful library design with some innovative concepts, Intuitive, modern and easy-to-use graphical user interface, Multi-PCB feature (different PCB variants of the same schematic), Automatic netlist synchronisation between schematic and board.

LibrePCB - A powerful, innovative and intuitive EDA tool for everyone

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