The Wildcat COBOL Compiler is an up-and-coming open-source COBOL compiler for .NET and Mono capable of compiling traditional COBOL programs and making use of object-oriented extensions and classes from external assemblies and the .NET framework. While the compiler still lacks support for some areas of the language, there are examples of what it's currently capable of, including algorithms such as the Towers of Hanoi and running NUnit tests by referencing the NUnit Framework assembly.
