EUR-Lex offers free and direct access to European Union legislation. The system enables the user to consult the Official Journal of the European Union and, among other things, the treaties, legislation, jurisprudence and preparatory work of the legislation. It offers a wide range of search options.

http://eur-lex.europa.eu/es/index.htm

Application of Community Law:

http://ec.europa.eu/community_law/index_es.htm

To legislate better:

http://ec.europa.eu/governance/better_regulation/index_es.htm