...Uncommon features in a common, cross-platform (unix, win32) setting. Written in tcl/tk, tease offers basic encryption, fast commenting/uncommenting, search/replace including regexp, unlimited undo/redo & more.
instrument/JTree is a Java library that lets developers add extra features to the JTree Swing component. It adds features such as drag and drop, reorganisation of the tree, node name edit, undo/redo etc.