Microsoft To-Do - Task management tool
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Gone - An ephemeral to-do list
KosmoTime - The to do list with super powers
Aurelium Life OS - All-in-one life organizer in Notion
Taskful - Deadlines, meet your match.