Since version 0.10.3, Stellarium's packages include a number of plug-ins: Angle Measure, Compass Marks, Oculars, Telescope Control, Text User Interface, Satellites, Solar System Editor, Time Zone, Historical Supernovae, Quasars, Pulsars, Exoplanets and Observability analysis. All these plug-ins are "built-in" in the standard Stellarium distribution and DON'T need to be downloaded separately.
To enable a plugin:
- Open the Configuration dialog (press F2 or use the left tool bar button)
- Select the Plugins tab
- Select the plugin you want to enable from the list
- Check the Load at startup option
- Restart Stellarium
If the plugin has configuration options, the configuration button will be enabled when the plugin is loaded and clicking it will open the plugin's configuration window.