Krita is a FREE and open source painting tool designed for concept artists, illustrators, matte and texture artists, and the VFX industry.
Inkscape
Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X.
तार से पुष्ट किया हुआ फ़ीता
GIMP is a cross-platform image editor.