Ecolabels are one of the key tools used to implement GPP - both to develop specifications or criteria and to verify the compliance of products and services with these standards. There are many different kinds of ecolabels, for example those which address a single issue such as the Energy Star label or those which cover multiple criteria.
The Buying Green! Handbook outlines how different kinds of ecolabels can be used at each stage of the procurement process.
Here you can find a non-exhaustive list of existing EU and international ecolabels. While steps have been taken to verify this information, its accuracy cannot be guaranteed.
More information on EU Ecolabel product groups here