Free! THINKING WORLDS is a drag-and-drop 3D scene builder and visual programming editor that allows non-coders to build immersive gaming experiences and simulations. It appears more suited for creating virtual training exercises in large organizations, but with a free developer license it should provide a sufficient challenge for the ultra-techie educator. Beware. This is more of a summer project than weekend quick pick -- just imagine the learning curve if there were Scratch controls for every movement in Sim City. But if you're up to the task, there's still time to join this recently started MOOC on gameification. After all, a tool is only as good as the outcomes it makes possible.
Free! METRYX is a formative assessment tool that allows teachers to "track, analyze, and differentiate" students across any number of customizable skill sets. Teachers can import class rosters and any number of skill sets via a CSV file, and then individually track students across each skill set as they perform various classroom activities. The granularity of these activities is completely at the discretion of the teacher, though Metryx appears especially useful for project-based learning, skills demonstration, and other activities where multiple-choice assessment data can't fully convey student progress.