From Shanghai Zhegui Software:
Zhegui Single Sign On is a web-based Single Sign On software product. Support J2EE/ASP/ASP.NET/PHP based background applications. Key features: ZSSO is a web-based Single-Sign-On system. Work as a reverse-proxy. Easy to use. Least modification is need for your existing apps. Configuration change should be done without restart. All background applications behind ZSSO share same users' credentials. User information and credentials can be stored in database/LDAP. Sign-in/sign-out log, web access log/access statistics. Support J2EE/ASP/ASP.NET/PHP based background applications. Access control With user+application / user+url. Seperate configuration parameter baed on each back-application, not whole SSO. Muliti-language with English/Chinese. High Stability, Efficient. Synchronized account data to your apps by webservice(XML) for creat / modify / enable / disable account.