Daniel Spiewak, editor for the EclipseZone, and I released Fuse 0.4 this weekend. Fuse is a resource injection library mainly thought for GUI programming. I presented Fuse several times in this blog already.
The two major features in Fuse 0.4, at least to me, are the resource caching to improve performance and the auto injection facilities. For instance, when you build a Swing UI, Fuse is able to detect any new component you add in a JFrame and automatically inject its resources.
While Fuse was created to help build Aerith, it lacked real world testing. Daniel has been using it for almost a year now in a large-scale product and this helped him get rid of many bugs and improve performance. Fuse is released under the BSD license and provides support for both Swing and SWT.