There's one at
https://github.com/mdszy/freecoinsIt's a Ruby (Sinatra) app, deploys to Heroku pretty easily and uses a Blockchain.info wallet. Looking at the code, the biggest downfall I see is that the configuration (including wallet password) is stored in a .json file that would need to be included in the git repo for deploying to Heroku. That's be easy enough to fix if you know a little Ruby.