Packages 
Package Description
net.sf.json
The core of the library
net.sf.json.filters
Support for custom serialization
net.sf.json.groovy
Groovy support
net.sf.json.processors
Support for custom serialization
net.sf.json.regexp
Regexp utilities
net.sf.json.test
Testing utilities
net.sf.json.util
Miscelaneous utilities
net.sf.json.xml
Utilities for trasforming JSON to XML and back.