Atlassian develops and provides software for startups and enterprises whose work process includes constant collaborations. Their products are beneficial for teams may it be a startup or an enterprise.
What Atlassian has in store for their customers are the kinds of software that are essential for planning, tracking, and support such as their Jira Software, Service Desk and Core. In terms of collaboration and communication, they have Confluence and HipChat.
Furthermore, the Atlassian Enterprise is a software which offers business critical products, premier support and strategic services that is essential in getting the most out of your Atlassian applications.
They also have products that are useful in coding, building and shipping such as BitBucket and SourceTree.