Well, I’m not a digital artist (yet 
) but I know a couple of digital art apps, like the following:
- Ibis Paint
- Krita
- Paint Tool Sai (know a bit about this one)
- Procreate
- Photoshop (I think you can draw using this one)
- Clip Studio Paint
- Medibang Paint Pro
Hope this was what you were looking for!