Annotate.tv - Optimize your learning on YouTube
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Slid - Capture knowledge from online videos, courses, and webinars
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Simply.Digital - Goals & Tasks - Todo list to track your time & help set meaningful deadlines
The ToDon't List - A to-do list for avoiding the things you shouldn't be doing