Using spaced repetition apps with 1Password to help you memorise passwords without storing them in plaintext: https://boinkor.net/2018/11/memorizing-passwords-with-anki-1password/
Cute idea, although ideally a password manager minimises the memorisation necessary. It's a nice example of composing apps though.
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I'm surprised by how many different weather forecasts I can get out different apps. Surely there aren't many API providers for weather predictions?
Alternative conspiracy theory: do weather apps that predict nicer weather get more downloads?
Bril is a cute intermediate language for teaching (think simplified LLVM IR): https://www.cs.cornell.edu/~asampson/blog/bril.html
The idea of providing a standard JSON format to help students write basic passes is really elegant.
"Example Driven Development" using Glamorous and Pharo Smalltalk: https://medium.com/feenk/an-example-of-example-driven-development-4dea0d995920
Tests returning values and composing is a really interesting model. It establishes structure and shows which test failure is the most 'fundamental'.