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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.
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IdentityServer
The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core
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eShopOnWeb
Sample ASP.NET Core 8.0 reference application, powered by Microsoft, demonstrating a layered application architecture with monolithic deployment model. Download the eBook PDF from docs folder.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Back to the main question, I've used OpenIddict in the past and it does basically the same things as Identity Server but there's less documentation.
auth0: https://auth0.com/
Here's also another example of creating JWT from the eshoponweb repo. https://github.com/dotnet-architecture/eShopOnWeb/blob/9db2feb930c8cd1ce379bbebf76521a4ba0dddfb/src/Infrastructure/Identity/IdentityTokenClaimService.cs