Freeplane does this and many other cool things natively. Freeplane: Gpl, multiplatform, icons, styles, images, links, connectors, foldable, clone-nodes, script

Freeplane does this and many other cool things natively. Freeplane: Gpl, multiplatform, icons, styles, images, links, connectors, foldable, clone-nodes, scriptable (groovy, jruby, jython, javascript), efficient even with huge maps Just have a look