Workflowy

Workflowy is a simple outlining tool that works in any browser or as an app on your device: Mac, Windows, Linux, Android and iOS. At first glance, it's a simple note-taking tool focused around bullet lists. It lacks the menu overkill of Microsoft Word or the complexity of Adobe software. It just puts a bullet point in front of you and nudges you to start writing stuff down. Within a bullet point, you can put sub-bullets. And each of those sub-bullets can have its own sub-bullets.