Browser based kingdom building game

I'm interested in a browser based MMO game, similar to existing products such as Evony, Travian and Valor for I-phone. I would like it to be coins enabled, and able to plug into facebook as an app, with the ability to boy coins for in-game bonuses. It needs to be open source code so that I'm able to edit and add things at a later date (so nice clean code.) Further work may be available at later dates to 'upgrade' the code. Please provide some proof that you are able to carry this out. Thank you.