FreeCAD，一个免费的3D CAD建模软件，
LibreCAD is a cross-platform 2D CAD program written in C++17. It can read DXF/DWG files and can write DXF/PDF/SVG files. It supports point/line/circle/ellipse/parabola/spline primitives. The user inte...
翻译 - LibreCAD是使用Qt框架以C ++ 11编写的跨平台2D CAD程序。它可以读取DXF和DWG文件，还可以写入DXF，PDF和SVG文件。用户界面是高度可定制的，并且具有数十种翻译。
Stanford Doggo is an open source quadruped robot that jumps, flips, and trots!
翻译 - Stanford Doggo是一款开源的四足机器人，可以跳跃，翻转和小跑！
Design circuit boards with code! ✨ Get software-like design reuse 🚀, validation, version control and collaboration in hardware; starting with electronics ⚡️
Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.
🫁 The world's first open-source ventilator tested on human patients. Mass-producible at a low cost (~2000€).
翻译 - 🦠3D可打印的Covid-19 DIY呼吸器（由SARS-CoV-2病毒引起）。目的是在爆发期间帮助医院应对专业呼吸器可能短缺的情况。