Backlog - A cloud-based project management app for developers and their teams.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Agilo for Scrum - Agilo for Scrum provides an intuitive workflow for your agile projects. Agilo addresses the needs of each scrum role and facilitates the ceremonies of the scrum process by exposing simple interfaces for managing the scrum artifacts.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.