Two sets of fonts are available for download:

1) South African special characters font
This font only includes the following special characters and diacritics that can be used for isiNdebele, isiZulu, Sepedi, Setswana and Tshivenda in current and older orthographies. For more on how to add Tshivenda diacritic characters in your documents go to Tshivenda : Diacritic Characters.

ZAsymbolsArial (For use with Arial and similar fonts)

ZAsymbolsRoman (For use with Times New Roman and similar fonts)

2) IPA Phonetic Alphabet
This font includes a number of phonetic symbols although it is not complete. For another version download SilIPA93 Font.