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.
Obie.ai - Access knowledge quicker without leaving Slack
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.
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.
Knowledge Plaza - Knowledge Plaza is a SaaS Platform dedicated to Social Knowledge Management.
Wimi - Project management software for SMBs. Online collaboration tool to increase productivity used by 25,000+ businesses.