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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.
Some of the best examples of opt-in APIs are in first-party Kotlin libraries. A great example is the kotlinx.coroutines library, which uses four different opt-in marker annotations across its API.
A common tool you can use for Kotlin projects is the Binary compatibility validator plugin. This plugin calls annotations that mark API that shouldn't be considered public "non-public markers".
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.