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FreeCAD is an open-source parametric 3D modeler used to design real objects, from a printed bracket or machine part to furniture and building models. Instead of drawing fixed shapes, you define geometry through dimensions and constraints that stay editable, so revising a design later is a matter of changing values rather than starting over. It suits mechanical and product designers working independently or in small teams, makers and 3D printing enthusiasts, engineering students, and anyone who wants capable CAD without a recurring license cost. Windows users get a single application covering constrained 2D sketching, solid modeling, multi-part assemblies with joints that simulate movement, technical drawings for manufacturing, finite element analysis, and CNC toolpath generation. Support for open formats such as STEP, IGES, STL, DXF, and IFC keeps projects portable, and files remain on your own machine. The software is released under the LGPL and is genuinely free, with no account, trial period, or paid tier, and it is maintained by a volunteer community backed by the non-profit FreeCAD Project Association. Windows builds are 64-bit only, with Windows 10 as the minimum supported version, and both a standard installer and a portable package are available. The main consideration is the learning curve: FreeCAD groups its tools into separate workbenches, and constraint-based modeling takes deliberate practice before it becomes comfortable, particularly for anyone coming from a traditional 2D drafting program. If you are willing to invest that time, the 1.x releases have made FreeCAD a practical working tool rather than an experiment, and since nothing needs to be purchased or registered, testing it against your own projects costs only the time you decide to spend.