On how far programming language research has come, and the maturity of tools and techniques that make more ambitious projects viable:
miniblog.
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PLDB is an ambitious project to catalogue all the different programming languages out there: https://pldb.com/lists/languages.html
It's showing a ton of potential (over 4,000 items recorded!) although it's still pretty young (I just fixed the LLVM IR comment syntax).
TIL that JetBrains has a product Spaces that competes with both GitHub (source hosting, CI) and Teams (chat): https://www.jetbrains.com/space/
It's an incredibly ambitious project.
Sometimes it's nice to have super ambitious side projects, but sometimes it's nice to tinker with simpler features. Today, I'm mostly writing CSS :)