10 cool features of the open-source blackboard Tableaunoir
https://tableaunoir.github.io/
0:03 Make animations
1:04 Progressive eraser
1:30 Use of a compass
2:06 Recolorize
2:27 LaTEX
2:46 Bigger magnets carry smaller ones
3:22 Prune animations
3:46 Interactive graphs
4:07 Magical magnets
4:36 Solving temporal paradoxes