
If the terms next action , someday/maybe list , and tickler file mean something to you then you know about David Allen and his popular productivity how-to book, Getting Things Done (GTD). Predictably, the book has spawned loads of computer-based applications to help you organize your life based on Allen's methods and principles.
Thinking Rock is a great open source app for implementing the GTD system. Licensed under the Common Development and Distribution License (CDDL), it works on Linux, Windows, and Mac -- perfect if you run different operating systems at work and home. Once you set up your contexts (@home, @work, @market), it's dead simple to process your actionable items and create to-do lists. A large empty window helps you collect your thoughts and ideas, then plug them into the correct lists via a drop-down menu.