Legislation

The Federal Institute for Occupational Safety and Health (BAuA) provides an overview on the most impotant OSH laws in Germany
http://www.baua.de/de/Informationen-fuer-die-Praxis/Rechtsgrundlagen-und-Vorschriften/Rechtsgrundlagen-und-Vorschriften.html (in German)

An overview on OSH legislation in Germany is also part on the Annual Report on Safety and Health at Work (SUGA) of the Ministry of Labour and Social Affairs (BMAS)
http://www.baua.de/de/Informationen-fuer-die-Praxis/Statistiken/Suga/Suga_content.html (in German)

The Federal Ministry for Justice and Consumer Protection provides a database on German legislation which can be found at http://www.gesetze-im-internet.de/ (in German)

Technical rules which supplement OSH legislation can be found on the information portal of the Federal Institute for Occupational Safety and Health (BAuA)
http://www.baua.de/de/Themen-von-A-Z/Themen-von-A-Z.html (in German)

Rules on prevention which are issued by the German Social Accident Insurance and also supplement OSH legislation can be retrieved from the information portal of the German Social Accident Insurance (DGUV)
http://www.dguv.de/de/Pr%C3%A4vention/Vorschriften-Regeln-und-Informationen/index.jsp (in German)