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I have been using procezo to manage many projects. Procezo provides all features of any other task management platform like Asana, but it's completely free.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Lurchr - Saves all your Slack links, so you can focus on work
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.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Google Drive to Slack - Slack notifications whenever you work on Google Drive docs