Symfony2 CMF is a content management framework built on Symfony2 that allows users to create custom CMS solutions. It provides tools like a content repository that developers can use to build their own CMS, rather than being constrained to one-size-fits-all systems. Interest in Symfony2 CMF is growing, with over 100 people on the mailing list and 10 more joining each month. Decisions are made publicly, and many companies are committed to the project.