GTD

Cookbook /
: Checklists Ephemeral to-do lists (Beta)
: Flipbox Flippable checkboxes and checklists (Beta)
: GTD-TLM An experimental JavaScript GTD task/todo list manager (experimental)
: MarkThingsDone Mark Things Done! - A Comprehensive Productivity System (Active)
: Reminder Birthday, anniversary and other task reminders (Stable)