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cadmapper.com
Cadmapper creates 3D CAD files of any area in the world from public data sources such as OpenStreetMap, NASA and USGS, producing organized, layered drawing files. Areas up to 1 km2 are free, files up to 100 km2 cost a small fee, and whole-city road network DXF files are free. It targets designers, architects and illustrators, with support for AutoCAD and SketchUp.
openscad.org
OpenSCAD is free software for creating solid 3D CAD models, available for Linux/UNIX, Windows and Mac OS X. It is not an interactive modeller; instead it reads a script file describing an object and renders the model. It focuses on CAD aspects rather than artistic modelling and provides constructive solid geometry and extrusion of 2D outlines.
resources.sw.siemens.com
Designcenter Solid Edge Community Edition is free professional 3D CAD software intended for personal use by makers, CAD enthusiasts and design challenge competitors. It supports designing parts, assemblies and sheet metal, with automated drafting, exploded views, animation, rendering and simulation. Files cannot be opened in commercial versions and 2D drawings are watermarked.
cadnav.com
CadNav is an online library of free 3D models, CAD models, textures and V-ray materials for CGI graphic designers and 3D artists. It also publishes articles on 3D software, game engines and tutorials for tools such as 3ds Max, V-Ray and SketchUp.
f3d.app
F3D is a fast, minimalist 3D viewer desktop application that is free to use, open source and cross-platform. It visualizes 3D data, with features including realistic rendering, animations, CAD designs, Gaussian splatting, volume rendering and scientific visualization. F3D was originally created by Kitware SAS and relies on open-source projects including VTK, OCCT and Assimp.
kicad.org
KiCad is an open source PCB design and electronics CAD suite for Windows, macOS and Linux. It includes a schematic editor, a PCB editor and a 3D viewer, and is described as forever free. The schematic editor supports hierarchical designs and includes an integrated SPICE simulator and electrical rules checker. Documentation is written and maintained by a volunteer docs team.
librecad.org
LibreCAD is a free open source 2D CAD application for Windows, Apple and Linux, released under GPLv2. It is available in over 30 languages, and support and documentation come from its community of users, contributors and developers.
openrocket.info
OpenRocket is a free model rocket simulator that allows users to design and simulate rockets before building and flying them. It offers a six-degrees-of-freedom flight simulation, CAD-based design, real-time performance data and design optimization. It is written in Java and is cross-platform, with source code available under the GNU GPL.