There is a booklet about Git integration: http://books.pharo.org/booklet-ManageCode/pdf/2019-03-24-Man...

For 2D graphics, Pharo uses Cairo binding named Athens (and Roassal as another convinient layer above that).

For 3D, you may be interesting in Godotalk (https://www.youtube.com/watch?v=ncmERef0EFo, https://pharoweekly.wordpress.com/2021/02/03/godotalk/)