The teaching and education products on the Alcoda Software website (like Write Source or Spell Magic, for example) offer a series of dictionaries by default. But of course, you can always add more, available on that same website, like this Afrikaans Dictionary, for example.
Afrikaans Dictionary contains all the standard terms for this African language, and you can add it as a plug-in to Alcoda Software.
When inserting this Afrikaans Dictionary plug-in you can do it using the dictionary`s update assistant, or simply by copying the decompressed file to the relevant folder.