Planner

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Create new plans, organize and assign tasks, share files, chat about what you're working on, and get progress updates. Microsoft Planner is a tool that gives users a visual way to organize teamwork. Teams can create new plans, organize and assign tasks, share files, chat about what they're working on, set due dates, and update status. Microsoft Planner also offers the ability to associate documents with specific tasks, edit them together, and have conversations around tasks.

Planner (o365)
Full NameMicrosoft Planner
Short NamePlanner
DescriptionCreate new plans, organize and assign tasks, share files, chat about what you're working on, and get progress updates
Bloghttps://techcommunity.microsoft.com/t5/Planner-Blog/bg-p/PlannerBlog
Docshttps://docs.microsoft.com/en-us/connectors/planner/
Roadmaphttps://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=planner
Uservoicehttps://planner.uservoice.com/forums/330525-microsoft-planner-feedback-forum
Techcommunityhttps://techcommunity.microsoft.com/t5/Planner/ct-p/Planner
Snippet from Wikipedia: Microsoft Planner

Microsoft Planner is a planning application available on the Microsoft Office 365 platform. The application is available to premium, business, and educational subscribers to Office 365.

On June 6, 2016 Microsoft made the application available for general release and intends to roll it out over coming weeks to eligible subscription plans.

Planner enables users and teams to create plans, assemble and assign tasks, share files, communicate and collaborate with other users, and receive progress updates via various means on the Office 365 platform. Each new plan created in Planner automatically creates a new Office 365 group.