Algorithm / Tree

Binary tree

https://www.cs.usfca.edu/~galles/visualization/BST.html

AVL tree

https://www.cs.usfca.edu/~galles/visualization/AVLtree.html

Red-Black tree

https://www.cs.usfca.edu/~galles/visualization/RedBlack.html

B-tree

https://www.geeksforgeeks.org/introduction-of-b-tree-2/
https://www.cs.usfca.edu/~galles/visualization/BTree.html

B+tree

https://www.cs.usfca.edu/~galles/visualization/BPlusTree.html

Reference

https://www.cs.usfca.edu/~galles/visualization/Algorithms.html