This page lists the supported platforms for JIRA Agile 6.3.x only. If a particular platform or a particular platform's version is not noted on this page, then we do not support it for JIRA Agile 6.3.x.
If you are not using JIRA Agile 6.3.x, see these pages instead:
JIRA Agile is installed as a JIRA add-on (plugin), hence JIRA Agile is supported on all platforms that are supported by JIRA. For details, please see the supported platforms page for the relevant JIRA version (listed on the right).