StepGreen is making it’s first foray’s into open source by releasing our SiteOverload plugin on GitHub. You can find it at http://github.com/stepgreen/site_overload.
We originally developed SiteOverload last summer to allow us to use a single codebase on a single server to run all our sites. Previous to this, each site had it’s own forked codebase. We are currently running three production sites using this, with two more in the pipeline.
SiteOverload draws on aussiegeeks theme_support plugin, with modifications to allow per site controller changes, and removing the need for theme specific helpers.