CATMaker and EBM CalculatorsOn this page you can download CATmaker, the CEBM’s venerable computer-assisted critical appraisal software, and use interactive EBM calculators. CATmaker is a computer-assisted critical appraisal tool, which helps you create Critically Appraised Topics (CATs), for the key articles you encounter. From the Centre for Evidence-Based Medicine at the University of Oxford.