jVi is a vi/vim editor clone built on top of the javax.swing.text package. Available for NetBeans and JBuilder. jVi is designed to quickly and easily integrate into many disparate java based desktop apps, from IDE's to mail-news readers.
Ptolemy is an extension of Java whose goal are to enable separation of crosscutting concerns, while retaining our ability to understand separated concerns modularly. It balances modularity and expressiveness for aspect-oriented software development.