If you prefer not to work on a LAMP (Linux, Apache, MySQL, PHP) stack you can check out the following projects that allow you to run Impact on different hosting environments:
Conner Petzold made a Node.js module that allows Impact to run on a Node HTTP server. His Node-Impact module is on GitHub at https://github.com/cpetzold/node-impact.
You can run Impact on IIS and .NET thanks to Mike Hamilton’s ImpactJS-IIS-.NET-API project, which you can find at http://code.google.com/p/impactjs-iis-backend.
Chris Darroch put together a Sinatra backend for Impact. Just
remove the .php extensions for the API calls in your
lib/weltmeister/config.js and fire up
impact.rb, which you can find at
Joe Esposito has a GitHub project that implements a backend server in Python for Impact to let you develop multiple games at once. You can check out the project at https://github.com/joeyespo/py-impactjs.