(Items in bold indicate possible concerns)
| Keycloak | WSO2 Identity Server | Gluu | CAS | OpenAM | Shibboleth IdP | LemonLDAP::NG | |
|---|---|---|---|---|---|---|---|
| OpenID Connect/OAuth support | yes | yes | yes | yes | yes | third-party | yes |
| Multi-factor authentication | yes | yes | yes | yes | yes | yes | yes |
| Admin UI | yes | yes | yes | yes | yes | no | yes |
| OpenJDK support | yes | yes | no³ | yes | yes | **[partial](https://wiki.shibboleth.net/confluence/display/IDP30/SystemRequ |