The top SSO tools commonly used today include Okta, Microsoft Entra ID, OneLogin, Auth0, Ping Identity, IBM Security Verify, JumpCloud, SecureAuth, ForgeRock, and Google Cloud Identity. In simple terms, all of them help users log in once and securely access many apps, usually through standards like SAML, OAuth, and OpenID Connect. Okta and Microsoft Entra ID are often top choices for large enterprises because they offer broad app integration, centralized access, MFA, and provisioning at scale; Auth0 and ForgeRock are strong for developers and customer identity use cases; Ping Identity and IBM Security Verify are solid for complex enterprise and hybrid environments; OneLogin and JumpCloud work well for SMBs and mid-sized organizations that want easier setup; Google Cloud Identity fits Google-first environments; and SecureAuth is often chosen where adaptive authentication and access control matter most. Overall, enterprises usually lean toward Okta, Entra, Ping, or IBM, SMBs often prefer OneLogin or JumpCloud, and developer-focused teams often like Auth0 or ForgeRock.