国外应用（需翻墙尝试）：
来自CAS官网推荐的Demo
http://casserver.herokuapp.com/cas/login
https://casserver.herokuapp.com/cas/login?service=http%3A%2F%2Fcasservermgmt.herokuapp.com%2Fcas-management%2Fmanage.html
https://sso.heroku.com/login
国内应用：
美团点评
https://ssosv.sankuai.com/login?service=https%3A%2F%2Fsso.sankuai.com%3Fa%3Db
view-source:https://ssosv.sankuai.com/login?service=https%3A%2F%2Fsso.sankuai.com%3Fa%3Db
广州视源电子科技股份有限公司
http://demo.hongjianguo.com/login
https://login.cvte.com/login?embed=true&service=https://ip.cvte.com/loginCas
view-source:https://login.cvte.com/login?embed=true&service=https://ip.cvte.com/loginCas
国家电网（版本很老）
http://iscsso.sgcc.com.cn/isc_sso/login
view-source:http://iscsso.sgcc.com.cn/isc_sso/login
https://pass.hust.edu.cn/cas/login?service=http%3A%2F%2Fhub.hust.edu.cn%2Fhustpass.action