I have migrated to GTD since few months, and I had looked for a software support for that methodology. I analyzed a lot of programs, and my choice was Todoist. These are my requirements:
- free (maybe I will subscribe the premium version, but I want to try before buying)
- recurring tasks
- “clean”, it must act as a “todo list” i.e. when I close a task it has to remove it from the list
- web-based (I want to access my information from different devices)
Todoist was the only service which was offering these features when I searched (now I don’t know). After some months, I can say I feel very comfortable with Todoist, since I don’t feel any lack. My productivity must thank Todoist for its maintenance!