Kinkless GTD is a free Mac-based "getting things done" list management system. It's a single OmniOutliner document that allows you to manage two views of your GTD tasks: projects and actions. You can archive completed projects to get them out of the way, and it should all look lovely in whatever colors and fonts you choose.
This is freeware (it's just some applescripts, after all), issued under the GNU General Public License. So, you know, go crazy and just share away.
For a video introduction on GTD, go here.