Lansweeper Sites supports both OpenID Connect (OIDC) and SAML for setting up SSO. Any identity provider (IdP) that supports at least one of these options is a suitable candidate for use with Sites.
Azure Active Directory, Google, and Okta are just a few examples of identity providers that you can use to log into your site.
SSO can be set up quickly and easily, as explained in the following KB article: https://community.lansweeper.com/t5/sites/set-up-lansweeper-sso/ta-p/64566
For popular providers like Azure and Okta, you can find more specific setup instructions in these articles: