We have developed these Jira apps ourselves. You can see the use cases for these apps via the overview of Jira use cases.
Use SAFe and agile methods with large software projects with over 10, 20, 100 teams.
draw.io
Create a wide variety of diagrams quickly and easily in Jira.
ICS - Issue Calendar Sync
Automatically integrate Jira issues into your personal calendar.
InstaPrinta
Easily print Jira issues.
Knowledge Base Custom Field for Service Desk
Link support issues with the customer portal's knowledge base
Project Archiver
The easiest way to get around in Jira - Track activities and archive your projects in bulk.
Project Role Inspector
View all project roles for all Jira projects quickly, no configuration necessary.
AutoPage
Create, link & update Confluence pages, page trees & the page content automatically through Jira.
Templating.app - Easy Issue & Subtasks
Create multiple epics, issue and subtasks based on custom templates.