Hello,

 that's great news, finally anyone can create and deploy an ADF application on any application server including Oracle's open source Glassfish server without any license! You can use core ADF functionality, namely:

• Oracle ADF Faces Rich Client Components
  

• Oracle ADF Controller

• Oracle ADF Model

• Oracle ADF Business Components

Some more enterprise grade functionalities still require purchasing the license, among the others:

• ADF Security (you can use standard JEE security or third party frameworks)
• MDS (customizations)
• Web Service Data Control (workaround - use WS proxy and wrap it as a Pojo DC!)
• Remote Task Flows
• HA and Clustering

You can find more information about this here