During the COVID19 pandemic CASUS developed and ran the Where2Test platform. It combined data collection about COVID infections with demographics as well as prediction and simulation of hypotetical scenarios. For this purposes it employed High Performance Computing, epidemiologc modelling, controll theory, and numeric optimization. In addition to traditional scientific papers, CASUS effort has produced several web applications that made the HPC forecasts available to general public, and provided useful tools for dealing with the practial aspects of life under pandemic such as workplace risk calculator, optimizer for office occupancy, or testing strategy optimizer for medical care facilities.