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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.
For the second and third question, no you don't have to pay the pkg creators (unless it's mentioned in the doc, or pkg's pub.dev. But i've never come across a creator who requires users to pay him for it. ) and you're not required to credit the the package creators but it's a nice thing to do if the package helped you a lot. Althought there are some packages that I've used that have some licencing stuff and terms of use, so read that.
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.