TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
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.
Synapbook - Synapbook is one of the powerful knowledge management tool for creating cloud-based notes in tree...
Standard Notes - A safe place for your notes, thoughts, and life's work
Taskwarrior - Taskwarrior is an ambitious project bringing sophisticated capabilities to a simple and elegant...
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.