Epic Time Tracking for Jira
Epic Time Tracking adds a panel to Jira issues that are assigned to epics. The panel shows some usefull time tracking values that help you keep track of the time logged on issues assigned to epics. You can find explanations for all the available values here.
By clicking on one of the labels like "Logged on epic" you can open an overview of the child issues on the epic. In this overview you can find the issue key, summary, type, status, logged hours, original and remaining estimates.