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HartreeFock
A program implementing the Hartree–Fock (also post-HF: MP2, CCSD(T), CIS and TDHF/RPA)/self-consistent field method (also DIIS) with Gaussian orbitals
The rest depends on the project. I have no shame in using some other language, but for some of the projects, my other choice would be... fortran. I like c++ more, so for this one for example https://github.com/aromanro/HartreeFock I used c++.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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cexprtk
cexprtk is a cython wrapper around "C++ Mathematical Expression Toolkit Library (ExprTk)". Using cexprtk a powerful mathematical expression engine can be incorporated into your python project.
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Had a very slow computer at the time and needed to convert lots of pixels and emulate a little processor (SPC700). So I wrote the utilities in x86 assembly. Eventually I got tired of that and decided to move up the chain some 😅... Today I still write using C++ because nothing else has really come along that satisfies my desire for low level control and perf, short of possibly Beef or Rust (but it's too obnoxiously opinionated for me, and the community seems allergic to useability/interoperability improvements, with the arrogant tone coming across as "well why don't you just rewrite it from scratch in pure Rust" 🤦♀️ - that said, I'd love to adopt a few features from it into C++).