Many REALbasic Plugins, including RBPluginPlunger, HTMLRendering and other great plugins

A kit for building REALbasic plug-ins with Apple's free MPW. Uses REALBasic Plugin SDK 4.5a1 and later.

Create fast and powerful database driven applications using REALbasic. It allows to drag easy to access classes of object-relational database directly into REALbasic project. [Shareware]