JIRA Client is a desktop application for JIRA power users. Works online and offline, offers fast issue navigation and drill-down, advanced issue triage, and more features to speed up the daily routine. Available for Windows, Mac OS X, Linux.
Enterprise-level issue organization and hierarchy - multi-level, cross-project, hierarchical lists of issues (not based on sub-tasks) with time aggregation, status rollup, synchronization with Links, JIRA Agile, Subtasks, and more.
Loads YourKit profiling agent into running JIRA and allows collecting CPU & Memory snapshots for further analysis in YourKit Profiler (purchased or downloaded for evaluation separately).