Relevant Logic

REALbasic

REALbasic is the best way of making cross-platform GUI software available today. It's a Visual Basic almost-clone, but significantly better.

It's also usually surprisingly easy to port VB code to REALbasic, which makes it a native-code cross-platform (Mac, Windows, Linux) application.

We're working on a book about object-oriented design with REALbasic. Preparatory to releasing the book, we have released the demonstration application from the book, UndoFlattenEdit. This application demonstrates the two included frameworks, the most advanced Undo and Flatten/Serialization/Marshalling frameworks available for REALbasic.