public ones are content moderation as above and previously llama guard, et al
OCR is also another field - Mistral have a model, so do deepseek
The ones I have experience with where you fine-tune smaller / faster models for business tasks like content writing, support, etc. by their nature stay private
Voxtral [1], maybe Robostral? I just saw on their blog they released OCR 4. Their is usually informative [2]