I'm not able to find the "Diagram Overlay" plugin in QGIS 2.6 (OS X) from the Manage plugin list.
Could anyone help me to download it?
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Sign up to join this communityYou can activate the diagram overlay for a vector layer in layer properties > diagrams:
As a core plugin it is included in QGIS. You can find more information here: How to draw bar diagrams on the map?