JIRA Client is a desktop application which provides instant access to issues in an Outlook-like tree view interface and works both when you are online and offline. It also has a number of such useful features as search query editor, customizable issue hierarchy display, linking issues using drag-and-drop, integration with IDE, and much more.

Key features:
(a) Interactive desktop interface instead of web access
You don't need to browse through a bunch of web pages to find the desired information - use a familiar Outlook-like tree view interface.

(b) Offline availability
Wherever you are offline or have a slow VPN connection, you can still work with your local copy of issues database and synchronize changes when you become online.

(c) Search queries
JIRA Client supports any combination of search conditions using Boolean logic. Found issues may be displayed in a hierarchical layout based on links or sub-tasks.

(d) Capture, edit and attach screenshots to your issues
In addition to just capturing screenshots, you can later edit them: crop, emphasize some area, provide comments, blur unnecessary information and zoom out the details.

(e) Track the time you spend on performing your tasks
JIRA Client aggregates the information on the time you spend on your issues and you can later analyze your workload in a time sheet and publish it.