Reconstructs java source from class files..
JCavaj Java Decompiler is a free Java-based Java Decompiler. It reconstructs the original source code from a compiled binary class file. You can decompile java applets, jar and zip files producing accurate java source code. JCavaj runs on any platform with Java Runtime Environment 1.4 or higher installed.
On January 22, 2008 updated, download size 800Kb, for Windows 98, 2000, XP, CE, Mac OS, Linux, Unix, Palm.

Java applet combines table/grid and tree view.
This Java applet combines both table (grid) view and tree view. So you can hierarchically organize your data and still have multiple columns to display not only node name, but also some properties of the item. Grid is editable, sortable, supports XML, dynamical data loading, custom icons, colors and fonts, JavaScript events, right-mouse menu, international symbols (like japanese), has comfortable API. Sources available.
On January 20, 2008 updated, download size 168Kb, for Windows 98, 2000, XP, CE, Mac OS, Linux, Unix, Palm.