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.
OpenMKS is a search & navigational tool for large multimedia collections. With pluggable functionality and a core subsystem supporting the z39.50 ZING Community SRW search & retrieval specification, it can be run either as a Servlet or as a Web Service.
SiteEngine is a Servlet based web subsystem purposed to simplify of managing of site content (but it is not a Content Management System, it is just a lib).
The DynaTalk DynAPI distribution is a DHTML library that includes an extensible client-side network/messaging subsystem, allowing developers to create truly live, stateful, and responsive web applications using open technology.
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