CorporateRegister.com 

CorporateRegister.com is the world's largest online directory of corporate non-financial reports. It currently features 14,030 reports from 3,766 different companies across 92 countries. These include Corporate Social Responsibility (CSR), sustainability, environmental and social reports. Registration is required for free access.

Sustainability-reports.com 

Portal for sustainability reports of multinational companies all over the world. You can download environmental, social, CSR and sustainability reports or you may order the hard copy version and receive it for free at home. You can browse the reports by sector, country or alphabetically by using the buttons on the top bar.

Learn from the Leaders 
 
SustainAbility and Flag have partnered to create Learn from the Leaders, an online, searchable database and customized research tool that brings together years of experience reviewing, analyzing and benchmarking sustainability reports. Learn from the Leaders includes over 350 specific examples of reporting best practice drawn from over 100 world-leading reporters, and you can search them in dozens of different ways first-time users will have to register first (free resource).