Krita
Replaces Clip Studio Paint
Create digital paintings, illustrations, comics, and 2D animation in a free, GPL-licensed desktop studio built for artists.
Open source alternatives to Clip Studio Paint
2 free, self-hostable tools you can use instead of Clip Studio Paint, sorted by GitHub stars.
Alternatives to Clip Studio Paint 2
MyPaint
Replaces Clip Studio Paint
Build digital paintings with a distraction-free desktop app built for graphics tablets, expressive brushes, and an infinite canvas.