Atlassian

Atlassian is a development and collaboration software company that offers tools and practices to help teams organize, collaborate, and complete work together.

• Jira is a work management tool for all kinds of use cases, from requirements and test case management to agile software development. It's a central hub for coding, collaboration, and release. For test management, Jira integrates with a variety of add-ons so teams can test effectively and iteratively.  
• Confluence is a team workspace with dynamic pages to give your team a place to create, capture, and collaborate on any project or idea. Spaces help your team structure, organize, and share work, so every team member has visibility into institutional knowledge and access to the information they need to do their best work. 
• Bitbucket provides a central place to manage git repositories, collaborate on source code, and organize development flows. It includes access control to source code, workflow control, pull requests for collaboration on code review, JIRA integration, and a full Rest API to build custom workflow features.