Clojure is a dynamic programming language that targets the Java Virtual Machine. It is designed to be a general-purpose language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure
jsc is a decompiler or a cross compiler if you will. It is not a source-code parser nor an IDE. It is a command line utility like any other compiler. jsc was originally an anagram for csharp to javascript.
NET2Java a new technology that helps you take an application written in Visual Basic or C# to the .NET platform, and translate it into a program written in Java source code. Right now its available through a NetBeans plugin that's included in the distribution files.