Similar to IGOR_Pro

Asymptote (vector graphics language)

Canvas X

ConceptDraw DIAGRAM

Corel AfterShot Pro

PaintShop Pro

Creature House Expression

Dia (software)

DigiKam

F-Spot

FITS Liberator

G'MIC

GIMP

GPhoto

ImageJ

ImageMagick

IPhoto

IrfanView

KolourPaint

Krita