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Gravitational Teleport
The easiest, and most secure way to access and protect all of your infrastructure.
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userd
Userd gathers user account information from the specified git repository, then administrates the Linux accounts and their ssh access across particular servers.
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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.
Checkout https://github.com/gravitational/teleport; it uses short lived SSH certificates to do the same thing.
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.