Moo.do is a powerful organization system, connected to all your services, with email and calendar built-in. Moo.do takes a unique approach with Markdown-based outlining and multiple panes to view your data, enabling you to use GTD, Kanban boards, or your own system to organize your projects, tasks, emails, files, and calendar all in one place.
Been using this for a few years as my primary todo list, I'm a happy user.
Pros:It's just text, but with collapsible hierarchy, and filterable prioritization. Exactly what I need
Cons:Not much. Small bugs occasionally, but they are usually pretty responsive
Moo.do is my favorite todo app. Its free-form, outline-based todo list is perfect for getting things out of my head. I also love that it makes it quick to turn emails into tasks.
Pros:Fast and easy to use
Cons:The mobile app works okay, but not as well as the web UI
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