那些年我们追过的GTD
Todoist
2014年出现最好的 To-Do List 工具，支持你所能想到的所有平台，自然语义添加提醒功能非常酷，Karma 值来记录你的成就，回顾过去的工作。个人也从 Doit.im 迁移到了 Todoist。
Trusted by millions, Todoist is the best online task management app and to-do list. For Web, iPhone, iPad, Android, Chrome, Outlook and many more!Wunderlist
中文名『奇妙清单』，几年下来累积了非常多忠实用户，界面美观，操作简单，功能强大。
OmniFocus
苹果系必备软件之一，GTD 老牌王者，OmniFocus 2 的推出惊艳无比，入门门槛略高，价格不菲。
OmniFocus for Mac, iPad, and iPhone is designed to quickly capture your thoughts and ideas to store, manage, and help you process them into actionable to do lists. Perfect for anyone.Doit.im
国内出品，经过几年的经营，从免费走向付费，个人感觉没有太多的进步，所以放弃之前的付费账户。
Doit.im is a Cross-platform Best Online GTD Service, which can sync with Phones. Under the guidance of excellent task management principles, Doit.im sort your mind out, to get rid of various pending ideas, and helps you organize tasks and focus on items in hand, so that you can closely track your work and feel easy when faced with bulks of complicated projects. With no pressure but efficiency, you’ll further enjoy your work and get unexpected success.Any.do
简洁和免费是巨大的优势
The #1 task management app used by over 11 million people globally, Any.do is your free mobile and online task manager for Android, iPhone, Web and more.TickTick
评论区中有人提议加上，简单试用了一下，感觉做的也非常不错，和 Doit.im 功能基本类似，基本功能免费+实验功能付费的模式也比较友好。
TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
评论（22）
截止时间那里有亮点，但是对于重复任务用起来很不方便。
奇妙清单试过一段时间，同步比较困难。
目前团队中在合作tower.im，太轻了，没有循环任务，没有单个任务提醒。