I have found very interesting functional language from russian developers community (RSDN). Short description from language site:
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Ela is a modern programming language that runs on CLR and Mono.<p>The language is dynamically (and strongly) typed and comes with a rich and extensible type system out of box. It provides an extensive support for the functional programming paradigm including but not limited to - first class functions, first class currying and composition, list/array comprehensions, pattern matching, polymorphic variants, thunks, etc. It also provides some imperative programming features.<p>Ela supports both strict and non-strict evaluation but is strict by default.<p>The current language implementation is a light-weight and efficient interpreter written fully in C#. The interpreter was designed to be embeddable and has a clear and straightforward API. The language comes with a command line utility (Ela Console) that supports interactive mode.