Lighthouse is a simple yet powerful GTD app to help you accomplish your goals. Lighthouse integrates with your email so that you can get update tickets through your inbox. It allows you to group related tickets and search through them using keywords. Integration of source control allows you to modify ticket properties from your revision log. And Lighthouse let´s you keep track of all your tickets via the ticket history window. Lighthouse can be used for public feedback of beta applications; it integrates directly with Subversion and it makes getting organized and keeping track of your project simple. There are paid versions available starting at $10 a month for personal use, with the highest priced coming in at $120 a month for the Platinum plan which allows you to manage an unlimited number of projects and gives you 30 gigs upload space; each paid plan comes with a 30 day trial version, and there is also a completely free plan; however projects cannot be archived and only two people per account are allowed.