You can navigate with the buttons. There are also extracts of the old Weimar Constitution. University of Wuerzburg. English Case Law of the German Constitutional Courts. This is an index of all judgments since 1953.
Some Judgments are avaliable in full text.
Very few are translated into English. University of Wuerzburg. Vertraege zur Deutschen Einheit. An index of International Treaties from Saarbruecken university. This site includes agreements of which Germany is not a party.