PYPL: PopularitY of Programming Language https://pypl.github.io/PYPL.html is a nice PL metrics tracker that's an alternative to TIOBE.
It has a clear methodology and it carefully chooses keywords to avoid e.g. Python metrics being affected by interest in snakes.
miniblog.
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I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
A search engine devoted to finding misspelled items on eBay! https://typohound.com/
I have sympathy for the Amazon model where pages are organised around specific products (i.e. aggregate by SKU). It saves every seller having to carefully write a generic product description.
Decompiling Super Mario 64 by carefully writing C that produces the same assembly!
https://gbatemp.net/threads/super-mario-64-has-been-decompiled.542918/
A huge task, although shipping the game without aggressive optimisations made it easier apparently.
