LemonLdap 是 Apache 的一个实现了 Web SSO 的模块，可处理超过 20 万的用户。
主要特性包括：
SSO for Web applications (Java, PHP, .Net, Perl, Ruby, Python, …).
Virtual Private Networks for external access (HTTP/HTTPS gateway).
Strong authentication (LDAP, Kerberos, X.509, CAS, Liberty Alliance).
Authorization based on LDAP filters.
Authorizations inside application (subdirectories, or file types).
LDAP groups management.
Session sharing (SQL, memcached, SOAP).
Configuration sharing (SQL, SOAP, LDAP).
Password policy compliant.
Dynamic application menu.
Password change form.
Push authentication trough HTTP Basic.
Form replay.
SAML Service Provider, identity Provider and Attribute Provider.
