A great thanks to the QGIS developers for this new version, with some exciting new features and improvements, such improvements to PostGIS connections in browser and the DB Manger tool, conditional formatting for attribute table cells, new expression functions, and much more. See the visual overview for highlighted changes.
Go to the download page for the source code or binaries for Windows or your favourite Linux flavour (packages may not be available immediately for all platforms yet, so check later again if not yet there).
Ecostudies 
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