We have created a system to distribute Search Engine Optimized content to any web server using any programming language that supports RESTful web services. This means that you can upgrade just about any website to be managed from a single centralized management. The system offers ranges of sophistication from a purely request -> display, to including cached files that when requested are checked for changes and served accordingly.
If you have a current website(or network of websites) that needs upgrading and have some custom software that would be costly to redevelop, you can upgrade individual sections of your site easily by installing just a single file and directing your web server to it. Any files that aren't found are referred to the 'engine' script which requests (and optionally caches) the required content and custom template from one of our centralized distribution centers or even one of your own custom installations and then displays to the end user in a completely transparent way. The system is optimized for search engine spiders and includes Google Analytics and Webmaster Tools support.
For security conscious companies the installation base can be kept safe on the intranet behind the DMZ and requests can be tunneled out to the public, in most instances with a single file and web server directive.