The way of doing scrum retrospective in a distributed team
Add-ons by Lizard Brain UG
Agile estimation tool for teams that are distributed in different timezones
Link your Google Docs to any JIRA issue easily
JQL Pro is an extension for JIRA, that allows you to search by various criteria using MongoDB syntax
Newrelic Integration for JIRA Cloud allows you to use your JIRA (or Service Desk) as a notification channel for Newrelic alerts.
Planning Poker is an agile estimation tool for JIRA. It helps developers to estimate their effort on different tasks in terms of story points, T-Shirts etc. Works best for distributed teams, but can also be used by teams within the same location.
Simple Edit is a WYSIWYG (like TinyMCE, but CKEditor) editor for user-friendly description and comments editing. Has such features as - inserting images, creating tables, creating reusable templates and many more
Toggl Integration for JIRA — your integrated time tracking, can be used with Toggl Desktop or Toggl Mobile