Astrid is described as 'At its core, Astrid is a open source todo list that helps you get stuff done. That's why Astrid makes it really easy to create lists of tasks, as well as set priority, set due dates, and times' and is a popular Todo List Manager in the Office & Productivity category. There are more than 100 alternatives to Astrid for a variety of platforms, including Windows, Online / Web-based, Android, iPhone and Mac. Most alternatives are Todo List Managers and Task Management Tools. The best alternative is Todoist, which is free. Other great apps like Astrid are WorkFlowy (Freemium), Asana (Freemium), Habitica (Freemium, Open Source) and Microsoft Office Outlook (Paid).
Organise your day, your projects, your life with minimal fuss. TodoListMe is dead simple with a touch of really useful features. * No need to create an account. Lists are stored locally automatically. * Optional sync to server functionality.
Qiknr is a simple objective to-do list. You don't need to register to get things done or some fancy email, calendar, multi-task agenda that takes so much time just to organise. Just assign the tasks you want, optionally place a time for its completion and start working.