-> scroll down to the Example Plugins section - download includes
org.eclipse.swt.examples.*.
The javadoc is included in the Eclipse SDK download. In the Eclipse
application:
Go to the menu Help -> Help Contents.
Click on Platform Plug-in Developer Guide.
Expand Reference -> API Reference -> Workbench.
The SWT javadoc is under org.eclipse.swt.*
There are also links to the doc from the SWT home page: