SolveSpace
SOLVESPACE is a free (GPLv3) parametric 3d CAD tool. Modeling 3d parts, drawing with extrudes, revolves, helixes and Boolean (union/difference/intersection) operations. Modeling 2d parts, draw the part as a single section, and export DXF, PDF, SVG; use 3d assembly to verify fit. 3D-printed parts, export the STL or other triangle mesh expected by most 3d printers. Preparing CAM data, export 2d vector art for a waterjet machine or laser cutter; or generate STEP or STL, for import into third-party CAM software for machining. Mechanism design, use the constraint solver to simulate planar or spatial linkages, with pin, ball, or slide joints. Plane and solid geometry, replace hand-solved trigonometry and spreadsheets with a live dimensioned drawing. Sketch sections using lines, rectangles, datum lines and points. Sketch circles, arcs of a circle, datum circles, cubic Bezier segments, C2 interpolating splines, and more.
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Voxelator
Voxelator is a free online app that allows users to paint and edit voxel-based models. A voxel is a single point on a three-dimensional grid that is spaced regularly, similar to 3D pixels. Voxel-based graphics have several advantages, including the ability to generate meshes and complex levels at runtime, and that it is easier to create voxel-based 3D models than regular models. Voxelator is a free software and you can choose which license to attach to the models you produce with it, and use them for any purpose -- commercially included (provided you did not use any external resources with limiting licenses).
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Altair SimSolid
By performing structural analyses on fully featured CAD assemblies within minutes, SimSolid is the game-changing simulation technology for designers, engineers, and analysts. It eliminates geometry preparation and meshing: the two most time-consuming, expertise-extensive and error-prone tasks performed in a conventional structural simulation.
Multiple design scenarios can be simulated quickly under real-life conditions. Early CAD models, in any common format, can be used. SimSolid tolerance of imprecise geometry means that, unlike CAD-embedded simulation tools, there is no need to simplify complex geometries before analyzing designs.
SimSolid supports all typical connections (bolt/nut, bonded, welds, rivets, sliding) and analysis of linear static, modal, thermal properties, along with more complex coupled, nonlinear, transient dynamic effects.
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Tebis
Tebis is a leading global provider of CAD / CAM and MES software and process solutions for the manufacturing industry. Tebis provides technology solutions for the manufacturing industry that improve efficiency, drive quality and produce better products. There is no problem that Tebis can’t solve. Our solutions deliver an immediate impact on product performance and long-term improvements in efficiency and reliability. We help company’s address today’s challenges while enabling tomorrow’s technologies. For your design and manufacturing, manufacturing planning and manufacturing documents. Tebis 4.1 is a complete parametric-associative CAD/CAM system with which all tasks in manufacturing preparation, design and CAM programming can be performed seamlessly in highly automated processing in a single system. Customers use the Tebis Browser – our free 3D data viewer for Tebis CAD model files– for communication within their companies and with suppliers.
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