Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Standard Notes - A safe place for your notes, thoughts, and life's work
Things - Things is an easy to use task manager.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.