You can read and listen to all the shlokas of Bhagwat Gita (with various scripts and commentaries) on the undermentioned site :
www.gitasupersite.iitk.ac.in/srimad?language=dv&field_chapter_value=1&field_nsutra_value=1&show_mool=1&htrskd=1&httyn=1&htshg=1&scsh=1&hcchi=1&scram=1&scmad=1&scms=1&etsiva=1&etpurohit=1&etassa=1&choose=1