diff --git a/more/free-programming-interactive-tutorials-en.md b/more/free-programming-interactive-tutorials-en.md
index 88f3ed6fd..614061d78 100644
--- a/more/free-programming-interactive-tutorials-en.md
+++ b/more/free-programming-interactive-tutorials-en.md
@@ -1,6 +1,7 @@
 ### Index
 
 * [Ada](#ada)
+* [Algorithms](#algorithms)
 * [Android](#android)
 * [Bash](#bash)
 * [C](#c)
@@ -58,6 +59,11 @@
 * [Introduction to Ada](https://learn.adacore.com/courses/intro-to-ada/index.html) - Adacore
 
 
+### Algorithms
+
+* [Data Structures Visualization](https://www.cs.usfca.edu/~galles/visualization/Algorithms.html) - David Galles
+
+
 ### Android
 
 * [Android Tutorial](https://www.tutlane.com/tutorial/android) - tutlane