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(b) think about an area of mechanical engineering that you are interested in, and try to think about code problems related to it. See if there are Open-Source libraries related to it (e.g., RepRap is a popular open-source 3D printing library - https://github.com/Duet3D/RepRapFirmware), and;
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.