Event manager application written in Groovy & Grails,

Wazaabi 2.0 is a dynamic Declarative UI Framework. It allows developers to design GUI parts of any application using EMF based graphical metamodels.

Okay, it's pretty easy to instantiate objects in Java through standard reflection. However there are many cases where you need to go beyond what reflection provides.

For example, if there's no public constructor, you want to bypass the constructor code, or set final fields. ...

This app helps to manage receipts,

odata4j is a new open-source toolkit for building first-class OData producers and first-class OData consumers in Java.

More info here:
http://agile.gis.geo.tu-dresden.de/web/Conference_Paper/CDs/AGILE%202012/proceedings/papers/Paper_Mueller_Moving_Code-Sharing_Geospatial_Computation_Logic_on_the_Web_2012.pdf

The Steam Condenser is a multi-language library for querying the Steam Community, Source and GoldSrc game servers as well as the Steam master servers. Currently it is implemented in Java, PHP and Ruby.

Experimental web interface framework for creating complex RIA applications using Java Script

- MVC (MVVM) with clean and simple architecture
- component oriented (yes, create reusable components with HTML!)
- client side Pub/Sub channels (safe and sound against asynchronous weirdness in computed values/expressions from models or in callbacks for other messages/events)...

Utilities to make writing of JSR 269 Annotation Processors easier. During the JSR process, the JSR 269 Expert Group identified a number of situations where there would be benefit in having utility classes to assist with some of the more complex requirements. These utilities were outside of the core requirements for JSR 269 and are not included in JSR 269. The expert group nevertheless wish to share these with the community, which we are doing in this project. You could think of this project as the reference implementation for what was left out, plus some other goodies....

Sefirs provides a Java Thread-like class that executes over simulated time. Time units are user-definable, there is no time quanta, and neither changes to the VM nor pre-processing (like bytecode re-writers) are required. Sefirs accomplishes this by providing a framework for native thread-based continuations in Java....