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uswds
The U.S. Web Design System helps the federal government build fast, accessible, mobile-friendly websites.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Other examples are "What every engineer should know about..", https://12factor.net/, https://semver.org/ etc.
FYI I recommend following U.S. gov't standards: https://designsystem.digital.gov/documentation/developers/
Dark/light mode is fine and all, however be wary of accessibility. Note that the US actually even publishes it's own CSS/JS framework similar to bootstrap. I believe (but I am not positive) it is here: https://designsystem.digital.gov/
I don't claim it to be perfect, but the last time I had the opportunity to use it, it put other UI/UX frameworks to shame.