Finally, a CMS That Gives You the Best of Both Worlds. With all the features of a headless CMS and the familiar authoring tools that marketers know and love, Agility will make everyone on your team happy. While headless CMS tools are popular, many just give you access to a collection of content entities. Agility allows your content team (or you) to define structure to your content based on the ‘physical’ pages on your site. Nice. Free developer/personal tier.