brickdots

Assign/Share a todo item to/with internal users by mentioning them.
<ol>
<li>Mention internal users when an admin wants to assign a todo item to colleagues by typing <code>@</code> when creating a todo item.</li>
<li>Mentioned users would get notification emails. A mentioned user would get an email with the todo item and the link to the edit page that the todo list is on. </li>
<li>Check your todo items on the dashboard. All your todo items (todos mention you) will be on your dashboard. You can go to the edit page by clicking an item.</li>
<li>
Create a todo list in many post types
These are the compatible post types.
<ol>
<li>Posts</li>
<li>WooCommerce Products/Orders/Coupons</li>
<li>Event calendar events</li>
<li>More to come</li>
</ol>
</li>
</ol>

Admin Todotastic

Admins can assign or share todo items attached to a post, a WooCommerce order, a product, and a coupon by mentioning internal users.

ggwicz

Simple Todo List is a widget for your WordPress dashboard that lets you keep track of todos in a simple, intuitive list.
Features
<ul>
<li>Simple AJAX interface in one self-contained Dashboard widget.</li>
<li>Simple Markdown-style formatting enabled; use * or _ for italic text, and ** for bold text.</li>
<li>Coming soon: live inline-editing.</li>
<li>Coming soon: simple drag and drop reordering.</li>
<li>Coming soon: code improvements.</li>
</ul>

Simple Todo List

The simple todo list is easy to setup and use. Unlike others todo list plugins, this one is non-obtrusive. Although functional, it would be nice to see some additional features offered:

Automatically group completed todos to bottom of list.
Automatically hide completed todos.
Option to toggle show/hide completed todos.



Pretty Easy, But Feature Short

The missing todo list dashboard widget for WordPress.

Admin Todotastic vs Simple Todo List