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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.
It sounds like what you're looking for is an identity provider.
A popular open source option is https://www.keycloak.org/
This application can manage your users, then you can use standards like OpenID or SAML to plug it into your application, of which there are usually many plugins to accomplish this depending on your tech stack.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.