In this paper we present the website Digital legacy of Mihailo Petrović Alas (1868-1943), the most distinguished Serbian mathematician, the founder of the so called Serbian mathematical school and the former professor at the University of Belgrade. This site is an extension of the project Digital legacies of the Faculty of Mathematics in Belgrade, http://legati.matf.bg.ac.rs. The aim of this project is to collect, digitize and present to the general audience the life and work of the prominent Serbian mathematicians.