One of the better known cases in Southern Africa is the incident in 1994 where a craft landed next to the Ariel School in Ruwa, Zimbabwe. 60 students saw the craft and its occupants. The case was investigated, among others, by John Mack.
Here is a two hour documentary on the case:
Update 1 October 2013: and here is a newly released documentary with new interviews with the original witnesses:
Update 18 February 2014: Nicolas Berasain from Exopolitics Chile did a presentation on the Ruwa case. The presentation is in Spanish, but there are English subtitles: