I am a french mathematic teacher in highschool, in Reunion Island.
Some Scratch's and Snap's projects made in classroom with my students are here :
https://nathalierun.net/lycee/piwigo

I began visual programming with Logo langage in 1991, then with Scratch langage in 2009 and now :
I work a lot with Snap! because of it's ability to create real mathematics functions.