What is the name of this plugin?

[Butonix]

[Brophy]

Have you tried looking at the following?

GitHub - julianlam/nodebb-plugin-sso-oauth: NodeBB Plugin that allows users to login/register via any configured OAuth provider.

NodeBB Plugin that allows users to login/register via any configured OAuth provider. - GitHub - julianlam/nodebb-plugin-sso-oauth: NodeBB Plugin that allows users to login/register via any configured OAuth provider.

GitHub (github.com)

[oplik0]

Or to be more precise: these are all separate SSO plugins. Just search for sso in plugins