The Law Library of US Library of Congress provides legal databases on the USA and worldwide: 

http://www.loc.gov/law/find/databases.php. 

For example, for international/multinational legal information, see the Library of Congress website:

http://www.loc.gov/law/help/guide/international.php

Eur-Lex gives access to EU law and cases:

http://eur-lex.europa.eu/homepage.html

The World Bank runs the International Centre for Settlement of Investment Disputes:

https://icsid.worldbank.org/apps/ICSIDWEB/Pages/default.aspx

For specific information on consumer law in the EU, see:

http://www.eu-consumer-law.org

For EU competition law and cases, see:

http://ec.europa.eu/competition/index_en.html

Many universities offer information on national and international legal systems and issues:

SOAS: https://www.soas.ac.uk/library/subjects/law/region/africa/primary-sources/

Harvard:  https://guides.library.harvard.edu/sb.php?subject_id=62427

Columbia: https://www.law.columbia.edu/library/research-guides

Legal firms:                       

Wolters Kluwer provide information on a variety of legal issues, for example on competition: http://www.kluwercompetitionlaw.com, and on arbitration: http://www.kluwerarbitration.com.  

Freshfields is another private practice providing legal information: http://www.freshfields.com/en/global/