Axiom - Axiom is a general purpose Computer Algebra system.
Spotify - Map shows when two people play same song at same time
Zontroy Generator - Let the computers do what they can
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
ZenRows - Are your web scrapers blocked once and again? ZenRows API handles premium proxies, anti-bot protection bypass, and CAPTCHAs, so you get the HTML from any website with a simple API call.
SoundCloud - Enjoy music & follow favourite artists