Does anyone have experience of GTD tools on the Linux platform? When I say tools, I'm thinking of off-line list management applications for projects and actions (not just email!).

So far, on the web I've only found Thinking Rock (which I've tried but didn't like so much), a Beta called Nozbe, and Tomboy. I also know there is a Outlook clone for Linux and I think it has tasks but am not sure how well it works for GTD.

My reasons for asking are partly curiosity. I've considered using Linux instead of Windows in the past. As far as I can see, available Linux applications cover everything I need except the possible exception of GTD. I've also recommended GTD to a friend but he only uses Linux and I want to suggest tools to try to implement it.

Thanks in advance for any responses.