fixes #945

free-programming-interactive-tutorials-en.md

@@ -105,6 +105,7 @@
 * [Codeschool Ruby paths](https://www.codeschool.com/paths/ruby)
 * [Ruby Koans](http://www.rubykoans.com/)
 * [RubyMonk - Interactive Ruby tutorials](http://rubymonk.com)
+* [The Odin Project](http://www.theodinproject.com/)
 * [Try Ruby](http://tryruby.org/)