Development: REALbasic
by The EditorREALbasic is a cross platform development environment for Mac OS X, Windows and Linux
From the Real Software website:
Use REALbasic to create software for Windows, Macintosh and Linux from a single set of source code! It’s cross-platform development that really works!
Create software faster, enjoy increased productivity
REALbasic is a rapid application development (RAD) environment that provides developers a marked increase in productivity over other cross-platform development tools. REALbasic includes drag-and-drop capability to enable you to quickly create a user interface design, then incorporate the code behind it to add power and functionality.Migrate Visual Basic applications to Linux and Mac OS X
REALbasic is highly compatible with Visual Basic, so Visual Basic developers are productive very quickly with REALbasic. REALbasic also comes with a utility to help convert Visual Basic projects to REALbasic where they can be compiled for Windows, Mac, even Linux — with the click of a checkbox.Create native cross-platform software
REALbasic 2006 runs on and creates software for Windows 98, NT, ME, 2000 and XP, Mac OS X and Linux, all from a single set of source code. REALbasic incorporates platform-specific intelligence, like user interface widgets, so software created with REALbasic looks and feels native, regardless of the development platform you created it on.

