Trello

 Trello is a popular, simple project management and team collaboration tool that organizes your projects into boards. It uses a kanban board view to let you easily visualize how the progress of the project is going. Here, projects and tasks can be organized into columns and moved around easily to indicate workflow. It is widely known for being one of the easiest project management tools to pick up and start using. Trello is now part of Atlassian, Inc. 

Founders- Joel Spolsky, Michael Pryor

Headquarters- New York, USA