Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
My Daily Planner - Organize your day with pen & paper. Free printable template.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
The Ultimate Productivity Stack - Curated directory of tools to supercharge your productivity
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Rithm - Chat with music