Siyabona Africa (www.krugerpark.co.za) An excellent, privately run resource on the park with everything from safaris to a Nature Guide and background articles.
Kruger Magazine (Check out their Facebook page.) Launched in the second half of 2017, this excellent glossy print mag is filled with interesting articles and good photography. It's available in the shops of most of the rest camps.
SAN Parks (www.sanparks.org/parks/kruger) Partly a booking engine but also filled with practical information on the park.