Spotify - Map shows when two people play same song at same time
JustNotepad.com - A free online notepad allows you to create any text or notes in your web browser.
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
TakeNote - A web-based note-taking app with GitHub sync and Markdown support.
SoundCloud - Enjoy music & follow favourite artists
recordando - note_space is a program for writing notes, presented as arrays of cards .