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Confluence is an enterprise-class collaboration and wiki system from Atlassian.

Atlassian Confluence is used by many commercial and non-profit organizations, including several Fortune 500 companies as well as high-profile open source projects.

Confluence features several enhancements over traditional wikis:

  • Content is organized in so called wiki spaces, which can be thought of as sub-wikis.
  • Content is organized hierachically.

Atlassian offers free licenses to open source projects, as well as "$10 Starter Licenses" for 10-user teams where the license fee goes to Room To Read.

JIRA is extensible and a wide range of plugins are offered which extend it and integrate it with a multitude of other products.