FamilySearch has developed a very extensive index of millions of people worldwide from many different sources. Granted there are errors and duplications, especially in a project its size, but the IGI (as it is called) is a great place to look for clues and find information on your ancestors and can help those working on their family trees. They have many South Africans indexed too. Try it out, but make sure you ALWAYS verify and source information with primary and origional sources to be sure its right.