SwingWT was a project to completely reimplement the Java Swing API over the top of SWT (the native UI kit used by Eclipse at the time).
It turned out to be a huge project.
I started and maintained the project for 4 years, starting in March, 2004. It was the UI library used by other projects of mine at the time. Some open source Java virtual machine projects incorporated it as it was the only completely free implementation of Swing available at the time.
I eventually abandoned it after I started to do more web applications and less UI development. Sun open sourced Java and the need for free JVMs and implementations of the foundation classes became unnecessary.
More info at sourceforge