Asana
Asana is primarily a project management tool that allows for collaborative lists and timelines. While it is useful just for personal use, it really excels at project and team management. Users can be assigned various tasks and subtasks with options to view deadlines in different forms such as calendar or Kanban lists. Like most modern project management tools, Asana supports a wide array of integrations with other pieces of software.
COST:
Free tier missing some features
Premium at $10.99 / month
Business at $24 / user / month