If you haven't heard of GSoC, check this out first: https://summerofcode.withgoogle.com/
TL;DR Google will help sponsor student or first-time contributor to write code for a free software project of your choosing.
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IfcOpenShell / Bonsai has a list of project ideas, but please do suggest your own! https://github.com/opencax/GSoC/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22Project%3A%20IfcOpenShell%22
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There are a bunch of other projects under the OpenCAX umbrella including BRL-CAD, OpenSCAD, LibreCAD, Appleseed and Manifold https://opencax.github.io/
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FreeCAD of course is there too! https://summerofcode.withgoogle.com/programs/2025/organizations/freecad
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OpenStreetMap https://summerofcode.withgoogle.com/programs/2025/organizations/openstreetmap
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Inkscape https://summerofcode.withgoogle.com/programs/2025/organizations/inkscape
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The GIMP https://summerofcode.withgoogle.com/programs/2025/organizations/gnu-image-manipulation-program
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CGAL https://summerofcode.withgoogle.com/programs/2025/organizations/cgal-project
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GNSS-SDR https://summerofcode.withgoogle.com/programs/2025/organizations/gnss-sdr
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See other orgs https://summerofcode.withgoogle.com/programs/2025/organizations