Great overview of LLVM passes, their design, and the pitfalls of phase ordering: https://llvm.org/devmtg/2014-04/PDFs/Talks/Passes.pdf
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Designing a GUI library for Rust, and an excellent overview of the many different approaches taken in GUI frameworks:
Excellent overview of WebAssembly, its asm.js predecessor, and how the Rust ecosystem fits in: https://youtu.be/CMB6AlE1QuI
Gerbil Scheme has a great looking website with a friendly overview: