FW/1 was created in July 2009 as a reaction against complexity and bloat in other frameworks in the CFML community. FW/1 itself is a single file, and provides a simple, convention-based approach to MVC (Model-View-Controller) applications, as well as REST APIs. Whilst it has become more sophisticated over time, it has remained a single file, focused on getting out of your way and providing the intuitive plumbing you need. For historical background, you can read the introductory blog post from July 2009.
As of release 3.1, FW/1 also includes DI/1 - a simple, convention-based Dependency Injection framework - and AOP/1 - a simple, convention-based Aspect-Oriented Programming framework. If those phrases don’t mean anything to you, don’t worry, you won’t need to know anything about them to get started. For a full list of changes in this release, see the Change Log.