Aranea is an Open-Source Java MVC Web Framework that provides a common Object-Oriented approach to building the web applications, reusing GUI logic and extending the framework. It comes with out-of-the-box support for nested flows and database-backed query browsing. Additionally it serves as an integration platform, allowing free intermingling of arbitrary frameworks, components and applications.
GridGain is a computational grid framework. Its goal is to improve general performance of processing intensive applications by splitting and parallelizing the workload. In many cases GridGain is used to achieve better overall throughput, better scalability or availability of services.
Following picture illustrates the basic idea behind processing grids:
jZeno is an open source java full-stack development environment that offers the ability to develop rich web applications. The main architectural goal of jZeno is to allow people to create web applications using pure java development as much as possible. Largely reducing the need to know technologies like javascript, HTML, CSS, database specific SQL, and tons of different APIs. Limiting the amount of APIs, technologies and programming styles allows developers to learn a smaller set of skills much deeper. We think this set of skills should be : a thorough understanding of java, OO development and design patterns.
Stripes is a presentation framework for building web applications using the latest Java technologies. The main driver behind Stripes is that web application development in Java is just too much work! It seems like every existing framework requires gobs of configuration. Struts is pretty feature-light and has some serious architectural issues (see Stripes vs. Struts for details). Others, like WebWork 2 and Spring-MVC are much better, but still require a lot of configuration, and seem to require you to learn a whole new language just to get started.