Proxyma is a multiple reverse-proxy library/webapplication with a cache subsystem and url-rewriting capabilities. The new core is based upon a flexible plugins subsystem easy to extend and customize. Recently this project was promoted to release 1.0.
J2EP is a reverse proxy running on a J2EE engine. The proxy is written in java and was originally designed with Tomcat in mind, but any engine should work fine. A set of basic mapping rules are included but they can easily be extended to your own needs.
jRevProxy is a lightweight reverse proxy server fully written in Java. jRevProxy accepts HTTP and HTTPS requests and translates these into new requests based on a set of rules. HTTPS with client side authentication (X509 certificates) is supported.
Next generation reverse proxy : provides authentication and authorization services for all incoming HTTP traffic, in addition to offering transparent web SSO to protected applications.
Oroena is a fully Java 2 Enterprise Edition powered Open Source Reverse Proxy engine. It provides unique session, security or server access management for a multi-server architectured portal.