The GNU Project has released version 0.90 of GNU Classpath, an incomplete free implementation of the core Java class libraries. New features in this release include HTTPS, Unicode 4.0.0, and RELAX NG and W3C XML schema validation. Many holes in Swing support have been filled in as well. gtk 2.4 or later is required fro GUI operations. GNU Classpath is published under the GPL with library exception.
Dan Creswell has released version 1.24 of the Blitz JavaSpaces Pure Java Edition. Blitz is an open source (BSD license) implementation of JavaSpaces that is Jini 2.0 enabled and implements smart indexing, tuneable persistence, and active/passive lease cleanup.