KiCad

KiCad is a powerful, open-source software application used for electronic schematic design and printed circuit board (PCB) layout. It provides users with a comprehensive set of tools for creating complex circuitry that can be used for various industrial, educational, and personal applications....
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The application boasts a user-friendly interface and allows users to choose from a diverse range of customizable templates for schematic design. KiCad also offers a wide selection of device libraries, including off-the-shelf components, microcontrollers, and programmable logic devices. Users can even create custom components to suit their specific project requirements.

With its advanced routing capabilities, KiCad offers a reliable and efficient solution for PCB layout design. It's equipped with features like copper pour, copper voiding, and differential pair routing. KiCad also includes a 3D viewer, enabling users to visualize their design in a realistic way and make any necessary adjustments before they move to PCB fabrication.