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...
FreeCAD vs Catia opinions
Free, simple, many interfaces in and out (STP, IDS, STL ...), still in development, many forums and macros available. BUT some bugs remain, hopefully we can find a workaround.
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.
VariCAD is compact, fast, easy to use, and provides everything necessary for mechanical design. VariCAD is sold "fully loaded", including all features and functions, for one affordable price. The system contains:
MakerSCAD is a web-based parametric 3D design software with a block-based programming language to create objects for 3D printing, animations, games and websites.Discontinued
Site certificate expired. Software itself hasn't been updated in a very long time, is incomplete, and doesn't function
Siemens NX software is an integrated product design, engineering and manufacturing solution that helps you deliver better products faster and more efficiently.
Siemens NX vs Catia opinions
They are aimed at the same target and share many features
OpenVSP (Vehicle Sketch Pad) is a geometry modeling tool for conceptual aircraft design. The software rapidly models aircraft configurations without expending the expertise required for traditional Computer Aided Design (CAD) packages.
SelfCAD is a simple but powerful 3D modeling software being used by beginners, professionals as well as both small and large businesses to create their 3D designs. With the program, users can be able to model, sculpt, render, and even slice designs.
Electra® Cloud offers impressive benefits that more than save time or eliminate tedious work, it leaves then engineer free to focus on the important parts of a design, the control scheme, operations and safety of the entire machine.