Protoreto is a GPL-licensed tool to create prototypes of graphical user interfaces (GUIs).
NOTE: This project is not actively maintained at the moment. If you'd like to continue developing Protoreto, please send an e-mail to: wikipedian@users.sf.net
Canyon is a Java framework for quickly developing Cooee (an Echo2 fork) applications using XML interface descriptors and Groovy scripting. Support is planned for Echo3, Swing and SWT