These plugins are included in the Geoshell installer:
geOCommandTime.dll
geOFlexiMenu.dll
geOLabel.dll
geOMail.dll
geoMenuLaunch.dll
geomp32.dll
geONSep.dll
geOSep.dll
geOSpacer.dll
geOTasks.dll
geOTile.dll
geOTray.dll
GeoVol2.dll
Each filename is linked to a page full of information about that plugin. There are a lot of other plugins avaiable, you can read about them here.