The year 2014 marked the four-hundred-and-fiftieth anniversary of Galileo's birth, making it the perfect occasion to present and illustrate a GeoGebra applet which reproduces some of Galileo's celebrated experiments on the uniformly accelerated motion, as reported on in "Discourses and Mathematical Demonstrations Relating to Two New Sciences." Our applet is inexpensive, makes up for the lack of a fully-fledged physics lab and can be used as an accompanying activity in an (open) online course. The version we present allows for an "empirical" test of three of the most relevant theorems in the third day of Galileo's "Discourses." By three different experimental setups, students can see a ball roll down a slope, take measures and perform data analysis, following Galileo's footsteps. The applet is made freely available on the internet, so it can be downloaded and modified to cater for different students' needs.