Groovy is an agile, dynamic language for the JVM which combines many features from languages like Python, Ruby, and Smalltalk and makes them available to Java developers using a Java-like syntax. It is designed to help get things done on the Java platform in a quicker, more concise, and fun way. It can be used as an alternative compiler to javac to generate standard Java bytecode to be used by any Java project or it can be used dynamically as an alternative language, such as for scripting Java objects, templating, or writing unit test cases.
OpenSubsystems is set of business components for Java applications such as security, search, inventory management, order processing, shopping, email and fax communication, document management, imaging, and others. The components can be used directly on top of Java Virtual Machine (POJO) or using various J2EE application servers (EJB). This is all without changing a single line of code.