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oauth2-proxy
A reverse proxy that provides authentication with Google, Azure, OpenID Connect and many more identity providers.
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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.
If it's web-based, then the usual retrofit is an HTTPS reverse proxy with strong authentication. It's not always a quick job with legacy apps, but it's worth it.
NOTE:
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Hence, a higher number means a more popular project.