The IEe-library is the result of work by the Executive Agency for Competitiveness and Innovation (EACI) to bring together in one place a range of relevant tools and guidebooks on energy efficiency, renewable energy applications and sustainable mobility. It includes items funded under the Intelligent Energy Europe (IEE) programme and a selection of instruments picked from over 2,500 EU funded projects (under Altener and Save, CIVITAS, Structural and regional funds, LIFE, RTD 2002-2006 and Phare). In addition, nationally and regionally funded tools and guidebooks have been included from the EU 27 Member States, Norway, Croatia, Iceland, the US, Canada and some international organisations. The aim of this inventory is to disseminate good practice, advice and practical instruments throughout Europe and beyond. Here businesses, energy professionals, researchers and policymakers alike can profit from a wide range of freely available material to help them in their everyday work. The IEe-library will also be a good starting point for (future) applicants and contractors to the IEE programme, to allow their projects to save time and costs by profiting from available tools and guidebooks rather than duplicating them.