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jekyll-auth
A simple way to use GitHub OAuth to serve a protected Jekyll site to your GitHub organization
Though if you want actual authentication, you’ll need a custom backend or use a service like Netlify (as you mentioned), GitHub Pages (looks like Jekyll Auth is end-of-life, but you can still use private deployments with a paid account), etc.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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staticrypt
Password protect a static HTML page, decrypted in-browser in JS with no dependency. No server logic needed.
Something like StatiCrypt
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