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Question2Answer - A Q&A site helps an online community to share knowledge.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Things - Things is an easy to use task manager.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
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.