Elixir - Dynamic, functional language designed for building scalable and maintainable applications
Spotify - Map shows when two people play same song at same time
Rust - A safe, concurrent, practical language
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
SoundCloud - Enjoy music & follow favourite artists