From ikvm

IKVM.NET Wiki

IKVM is a Java VM that run inside of a .NET application. It is possible to convert *.jar files to .NET assemblies with the compiler. Or you can convert it on the fly at runtime. With IKVM is it possible:

• to run an existing Java library inside your .NET application
• to convert an existing Java application that it can run on the .NET platform. This is possible for console applications and for GUI applications.
• to access Java code from .NET
• to access .NET code from your Java code.

Of course there are also limits in the current implementation.

FAQ

• Q: Which library/programs are compatible with IKVM?
  A: There is a list of compatible libraries.

• Q: How can I edit this Wiki?
  A: To prevent spam new user can not edit wiki pages.

• Q: How can I build IKVM from CVS?
  A: See here.