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.
N. AbouGhazaleh, B. Childers, D. Mosse, R. Melhem, и M. Craven. LCTES '03: Proceedings of the 2003 ACM SIGPLAN conference on Language, compiler, and tool for embedded systems, стр. 284--293. New York, NY, USA, ACM, (2003)