Onshape!

SketchUp (formerly Google Sketchup) is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, civil and mechanical engineering, film, and video game design—and available in a freeware version, SketchUp Make, and a paid version with additional functionality, SketchUp Pro.

FreeCAD is a general purpose parametric 3D CAD modeler. The development is completely Open Source (LGPL License). FreeCAD is aimed directly at mechanical engineering and product design but also fits in a wider range of uses around engineering, such as architecture or other engineering specialties.FreeCAD features tools similar to Catia, SolidWorks or Solid Edge, and therefore also falls into the category of MCAD, PLM, CAx and CAE. It is a feature based parametric modeler with a modular software architecture which makes it easy to provide additional functionality without modifying the core system.As with many modern 3D CAD modelers it has many 2D components in order to sketch 2D shapes or extract design details from the 3D model to create 2D production drawings, but direct 2D drawing (like AutoCAD LT) is not the focus, neither are animation or organic shapes (like Maya, 3ds Max, Blender or Cinema 4D), although, thanks to its wide adaptability, FreeCAD might become useful in a much broader area than its current focus.FreeCAD makes heavy use of all the great open-source libraries that exist out there in the field of Scientific Computing. Among them are OpenCascade, a powerful CAD kernel, Coin3D, an incarnation of Open Inventor, Qt, the world-famous UI framework, and Python, one of the best scripting languages available. FreeCAD itself can also be used as a library by other programs.FreeCAD is also fully multi-platform, and currently runs flawlessly on Windows and Linux/Unix and Mac OSX systems, with the exact same look and functionality on all platforms. »

AutoCAD is a software application for both 2D and 3D computer-aided design (CAD) and drafting — available since 1982 as a desktop application and since 2010 as a mobile web- and cloud-based app, currently marketed as Autocad 360.

LibreCAD (originally QCad then CADuntu) is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.

SolveSpace is an Open Source 2D and 3D CAD (computer-aided design) program. It is a constraint-based parametric modeler with simple mechanical simulation capabilities. It is developed by Jonathan Westhues.

Autodesk Fusion 360 Is an Integrated Form, Function and Fabrication Experience

Shapr3D is a revolutionary 3D modeling software created exclusively for your iPad Pro and your Apple Pencil.

Browser based 3D solid CAD editor, Openscad style, with a Coffeescript based syntax, using only Coffeescript + Javascript

Tinkercad is a super easy-to-use, browser based 3D design tool. With Tinkercad you can create 3D printable items: toys to play with, decoration to light up your home or jewelry to express yourself. You dream it, you can make it!

progeCAD Smart 2009 is a limited version of progeCAD . It is free for private, non-commercial use only. You need to register the software to continue using it after 30 days. Of course registration is totally free.

Free download software to design 3d models for 3d printing and fabrication for Windows, Mac OS X, iphone, ipad

ZW3D, an integrated CAD/CAM solution designed for the complete product development process, features the fastest kernel for Solid-surface Hybrid Modeling, non-solid mold parting and smart CNC Machining tactics from 2 axis to 5 axis. It brings customers endless benefits such as reduced costs, optimized design workflow and improved efficiency. ZW3D Versions·Standard·2 Axis Machining·Lite·Professional·Premium·3 Axis Machining·Student

ScratchyCAD is a web-based parametric 3D design software with a block-based programming language to create objects for 3D printing, animations, games and websites.

View, capture, personalize, and print 3D models. Download many kinds of 3D files and edit them using the 3D modeling space. Take a picture with your webcam and make it 3D. Needs Windows 8.1 or higher.