There are two websites I do use regular to search for laws in Germany and in EU, which I can highly recommend:
German law: https://www.buzer.de
This is in German language only, but the best source I know of. Very quick search engine, historical development per paragraph and so on. Very helpful.
If you need English wording: http://www.gesetze-im-internet.de
Where’s a translation to English (by far not to all laws) there is an UK flag in one of the top rows to switch to the English wording of the respective law. The menus and everything else stays in German.
EU law: https://lexparency.org
Functionality similar to buzer but dedicated to EU law. Very helpful, too.
If you need other languages, there is always a link to EUR-LEX, the official website of EU directly to the directive or regulation to choose whichever EU language you might need.