Getting Things Done (GTD)
Getting Things Done, or GTD, is a productivity method developed by David Allen. It gives you a structured way to capture, clarify, and organize everything that demands your attention, so your mind can stay clear and focused on the work that matters.
For a deeper look at GTD, including a pragmatic setup that has worked for over ten years, read: Ten Years with GTD: How a Pragmatic System Still Keeps Me Productive.