https://www.openfest.org/2015/en/2015/10/11/books-at-openfest-2015/ OpenFest is the only conference of its kind in Bulgaria, dedicated to open culture, free and open-source software, the free exchange of knowledge - a festival of the open culture. Sun, 11 Oct 2015 15:14:14 +0000 hourly 1 https://wordpress.org/?v=5.2.20