FB3 Lite is a very simple front controller for HTML apps in the style of Fusebox 3 and Fusebox 5. It uses the FB3-style fbx_Switch.cfm (with a big CFSWITCH inside), but provides do() and include() UDFs that provide functionality analogous to the like-named verbs in Fusebox 5, including content variable support.
Just grab index.cfm, create fbx_Switch.cfm and you're done. The FB3 Lite source is available from Subversion, either for direct consumption or svn:externals.