Curl ORB is to comunicate between Curl and server side java. It can generate Curl source code from POJO which stands for Plain Old Java Object, and invoke the java methods on server side from Curl application.
Curl Lib - Extended components for Curl language, such as String utility, collection utility, UI utility, logging, log-rotate, data caching, encrypt/decrypt and such.
Curl Advanced UI libraries - Advanced User Interface libraries provide components necessary for creating rich user interface applications easily. Please see the detail info in Wiki page.