Party Line - Use Slack to manage your projects
Nifty - Manage projects, work, and communications in one place.
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.
Product Frameworks - Discover product frameworks used to help build products
UpDiagram - Free agile project management tool for scrum team
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine