The American Philatelic Society
Cape and Natal Study Circle
Orange Free State Study Circle
The Rhodesian Study Circle
South Africa Philately & SA Collectors Society
South African Philatelic Dealers Association
Transvaal Study Circle
Botswana Post
Eswatini Post & Telecommunications
Namibia Post Philatelic Services
South African Post Office
South African Post Office Philately
Deverell / MacGregor - The Rhodesias and British Africa
Henk de Lange - SA Stamps
Krone Stamps - World-wide. Specialising in Southern Africa
Steven Zirinsky Stamps -- British Africa
AlbumEasy - Free software for stamp album page layout and design
KGVI Stamps - British Colonial Stamp Site Links
The Philatelic Database
Toke Nørby's Perpetual Calendar
WADP Numbering System