Todoist, Things, ToDoList, Workflowy, TickTick, Focalboard, OmniFocus, Taskade, MyLifeOrganized, NowDo, Remember The Milk, sleek, Todolicious, Toodledo, nag reminder, Calcurse, iMDone, Zendone, TaskLite, Task Office: to-do, calendar, Taskbook, dstask, Gnome To Do, Yokadi, cloudpad, Qiknr, DevTodo, Domestica are some alternatives to Taskwarrior.