An Unlambda Interpreter written in Haskell. It's basically a cleaned-up version of this, where I added the REPL and the cabal files.
Unlambda has a cabal toolchain, which means you can install it by issuing cabal install
if you have the tool installed.
You can run files like with any regular interpreter by using the command
unlambda yourfile or go into interactive mode by running unlambda without
any other arguments. You will be greeted by your run-of-the-mill shell.
Have fun!