The Southern African Legal Information Institute is the greatest resource of South African cases and legislation. Their coverage ranges from tribunal decisions to Constitutional Court cases. They also have a large range of legislation and a few journals as well.
The Laws of South Africa is a project by the University of Pretoria to make available the South African Consolidated Legislation, including historical versions of Acts.
Access them via the following link: http://www.lawsofsouthafrica.up.ac.za/