What's a good tool for Project Management?

I work with multiple software teams and they're all using different tools for project management. I'm curious what project management tool people prefer, and why.
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Trello

Organize anything, together

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
Trello is really great. I'm currently using it to collaborate with a few freelancers on a project. Easy to setup and it's free for the basics, which is all we need!
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