Shapeless is a type class and dependent type based generic programming library for Scala. It had its origins in several talks by Miles Sabin, and he has been the main contributor to the project.
Free Monads and Stockfighter
StockFighter is a game by Patrick McKenzie (Hi Patrick!) and others that makes you compete in a virtual Stock Exchange to accomplish certain objectives. They use it as a recruitment tool (kind of, read their website) but it's a very entertaining game, even if you are not looking for a new job.
Free Monads using FreeK
My previous post on Free Monad implemented a few DSL using Free Monads. The same day I published it I discovered FreeK by Pascal Voitot. How does FreeK help you when building a Free Monad?