Local:
Cape Town Amateur Radio Centre main website
Cape Town Amateur Radio Centre ClubLog page
Boland Amateur Radio Klub
False Bay Amateur Radio Club
Oakdale Club - Amateur Radio Section
Western Cape Repeater Working Group
Regional:
Bloemfontein Amateur Radio Club
Border Radio Club
Centurion Amateur Radio Club
Highveld Amateur Radio Club
Highway Amateur Radio Club
Kempton Park Amateur Radio Technical Society
Magalies Amateur Radio Club
Midlands Amateur Radio Club
North-West Amateur Radio Club
Northern Cape Amateur Radio Club
Overberg Amateur Radio Club
Port Elizabeth Amateur Radio Society
Pretoria Amateur Radio Club
Rustenburg Amateur Radio Club
Sandton Amateur Radio Club
Sasolburg Amateur Radio Club
Secunda Amateur Radio Club
Southern Suburbs (of JHB) Amateur Radio Club
Sutherland Amateur Radio Club
Vrystaat Amateur Radio Klub
West Rand Amateur Radio Club
Zululand Amateur Radio Club
National:
Antique Wireless Association
Hamnet
Radio Shack South Africa
South African Amateur Radio Development Trust
South African Amateur Radio Satellite Association
South African Radio League
Youth in Amateur Radio
International:
American Radio Relay League
International Amateur Radio Union
Namibian Amateur Radio League
Radio Society of Great Britain
Other Useful Websites:
AC6V's Amateur Radio & DX Reference Guide
eHam.net
QRZ.com
The complete 73 Magazine archive
VK4ZQ's interesting wordpress ham projects site