sources
Design tools
(Free) Tinkercad is a free online collection of software tools that help people all over the world think, create and make.
DesignSpark Mechanical
designspark/mechanical-software
(Free) Whether you're looking for a design alone tool, a range of technical information, a complete design ecosystem, our complete suite can be integrated seamlessly into your existing design workflow
Autodesk Meshmixer
www.meshmixer.com
(Free) Do you need to clean up a 3D scan, do some 3D printing, or design an object that fits something else? Meshmixer can help. Think of it as a sort of "Swiss Army Knife" for 3D meshes.
Autodesk Fusion 360
www.autodesk.com
(Free for students and teachers) Autodesk Acquires Spacemaker: Offers Architects AI-powered Generative Design to Explore Best Urban Design Options