I built

Knodium ( Demo video: https://www.youtube.com/watch?v=gOPuWi-dbQg ; Technical video: https://media.ccc.de/v/c116_lisp_-_2013-08-25_11:15_-_buildi... (sound comes in after the first couple of minutes))

and

Registers.app ( https://registers.app )

in Chicken ( http://call-cc.org/ )

...and would recommend it.

The community in #chicken on freenode is really quite something. They're happy to help with all sorts of problems, even basic ones and get stuck in over and above expectations when problems get tough and technical.