Quire

Nested task lists are the organizing idea behind Quire: tasks can contain subtasks, which can contain their own subtasks, letting a large project break down into pieces without losing the thread back to the top-level goal. Kanban boards sit alongside that structure for people who want a more visual view of the same work, and the interface stays clean enough to keep the hierarchy readable instead of cluttered. That combination tends to appeal most to product and engineering teams, who are used to thinking in terms of tasks, subtasks, and dependencies between them. The free tier is generous enough for small teams to get real use out of the tool before paying, which is unusual in the category.