OrCAD 16.5, released by Cadence Design Systems, was a landmark version for electronic design automation (EDA). Many engineers and students still seek it out because:

An open-source powerhouse that is rapidly becoming the industry standard for hobbyists and startups.

Cadence offers a of the latest version of OrCAD. This gives you access to the full suite of tools, including PSpice and PCB Designer, for a limited time. It is the best way to test the software's capabilities without any security risks. 2. OrCAD PSpice Designer Lite