Frictionless is my free program designed to make keeping track of your next action as easy as possible. In other words, it's a to-do list program in the GTD style. That is unlike most to-do list programs, its designed to encourage you to turn projects into actions, and to show you only the actions that you can currently perform at any one time (or want to perform). That is, it first encourages you to turn something on your to-do list that really requires a whole set of actions on your part into a list of the actions required. Then, it lets you clear out those actions that you can't do at the moment and focus on the things you can focus on. It builds on the work of both David Allen and Steven Covey, from their respective books Getting Things Done and First Things First. Of the two books, Getting Things Done is the critical book; I can't recommend the book highly enough.
My development blog is posted below with the changes as they come. The new version is currently in the development stage, which means its not even at alpha/beta yet. So it can be buggy and its far from polished. Yet I'm using it every day.
You might want to look at a screencast showing Frictionless in action here.