RBDevZone is the home of several open-source software products, including:

• RBUnit, the open-source unit testing framework for REALbasic
• UltraToolBar, the open-source toolbar framework for REALbasic
• RegCode, the open-source framework for generating registration codes

In addition, RBDevZone hosts lots of free classes, controls and code samples.

And there are other open-source projects being developed in the community:

• MacOSLib -a collection of REALbasic classes that exposes more of the Mac OS API than is provided by the REALbasic framework
• RBJottings – a variety of REALbasic classes and controls
• RBScriptJottings – a variety of scripts for use with RBScript
• RBRW-Core – a reporting engine for REALbasic
• RBStuff – a variety of REALbasic classes, including Karel the Robot
• HelpRunner Module – Native support for Windows and OS X help files
• iChart123 – A slick charting solution
• Zymail – A cross-platform e-mail client
• AnimationKit – Animate your controls
• HIToolBar – Customize OS X toolbars at run-time
• OS X Search Field – Add the rounded search field to your OS X apps
• Multiple Document Application Template
• HTTP Server – An actual web server built with REALbasic
• XML RPC – XML Remote Procedure Calls
• PNG Utilities Plugin – Very useful for loading PNG images with alpha channel masks
• Case Sensitive Dictionary – A drop-in replacement for the built-in REALbasic Dictionary
• StringUtils, a public domain string library for REALbasic
• RB2Doxy – Convert REALbasic code to work with Doxygen