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LocalStack
💻 A fully functional local AWS cloud stack. Develop and test your cloud & Serverless apps offline
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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Cloud-Free-Tier-Comparison
Comparing the free tier offers of the major cloud providers like AWS, Azure, GCP, Oracle etc.
Have you tried https://localstack.cloud/ you can use it to mock your public cloud.
If it's just Kubernetes you want to learn and not the cloud itself https://minikube.sigs.k8s.io/docs/start/, https://k3s.io/ or similar dists will do just fine to learn how to run services in the cluster itself
This may help: https://github.com/cloudcommunity/Cloud-Free-Tier-Comparison