All these tab panels ('Road Map', 'Change Log', 'Popular Issues' and 'Open Issues') are implemented as plugins. New project tab panels can be implemented to display project-specific info.
Here is an example panel module descriptor:
One thing that threw me in this example is the <Label> tag. I couldn't get it to work as worded, I needed to change it to:
<Label>Tab Label</Label> to get the tab to show up.
Also note that the screenshot above is old, possibly pre JIRA 4.x.
This is a better page for creating project tabs.
How to create a JIRA Project Tab
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