Performance Considerations

Raspberry Pi 4 Recommended: For any CAD software, Raspberry Pi 4 with 4GB or 8GB RAM is recommended for better performance.
Overclocking: If you're comfortable with overclocking, it might provide a slight performance boost, but be cautious of potential overheating issues.
Lightweight Desktops: Using a lightweight desktop environment (e.g., LXDE or XFCE) can free up more system resources for the CAD application.

Blender (for basic CAD tasks)

Overview: Blender is a powerful open-source 3D modeling and animation tool. While not a traditional CAD program, Blender can be used for 3D modeling, especially if you're working on projects that require a lot of artistic freedom.
Suitability for Raspberry Pi: Blender is resource-intensive, but it can be run on Raspberry Pi for basic 3D modeling tasks. However, performance will be limited, so it's not recommended for complex projects.
Installation: Installable via the terminal.

bash

sudo apt-get install blender

OpenSCAD

Overview: OpenSCAD is a script-based 3D CAD modeler that is highly efficient for creating 3D models using programming. It's particularly suited for those who prefer coding over traditional CAD design interfaces.
Suitability for Raspberry Pi: Since OpenSCAD relies on scripting and is relatively lightweight, it can run smoothly on a Raspberry Pi.
Installation: Can be installed directly via the terminal.

LibreCAD

Overview: LibreCAD is an open-source 2D CAD application that is relatively lightweight and good for creating technical drawings and schematics.
Suitability for Raspberry Pi: LibreCAD works well on the Raspberry Pi for 2D drafting tasks. It's less demanding than 3D CAD software, making it a viable option.
Installation: Installable via the terminal.

bash

sudo apt-get install librecad

SolveSpace

Overview: SolveSpace is a lightweight, open-source 2D/3D CAD program that offers parametric modeling, simple mechanical simulation, and 2D vector drawing.
Suitability for Raspberry Pi: It is less resource-intensive than many other CAD programs, making it a better fit for Raspberry Pi's limited hardware.
Installation: SolveSpace is available for Linux and can be compiled from source or installed using a package manager.

bash

sudo apt-get install solvespace

Running a full-fledged CAD (Computer-Aided Design) program on a Raspberry Pi can be challenging due to the limited processing power and memory compared to traditional desktop computers. However, there are a few lightweight CAD programs and alternatives that can work on a Raspberry Pi, especially on the more powerful models like the Raspberry Pi 4.
Best CAD Programs for Raspberry Pi

FreeCAD
Overview: FreeCAD is an open-source parametric 3D CAD modeler that is feature-rich and can be used for a variety of design tasks, including mechanical engineering, product design, and architectural design.
Suitability for Raspberry Pi: FreeCAD can run on a Raspberry Pi, especially if you optimize the system for performance. While it may not be as fast as on a regular PC, it's one of the most powerful options available that can work on a Raspberry Pi.
Installation: FreeCAD can be installed via the terminal on Raspberry Pi OS.

bash

sudo apt-get install freecad