
ASEPRITE
Animated sprite editor & pixel art tool
Bug Squish
Squash the bugs before they suck up your blood
Cenon
Vector graphics application for GNUstep
Childsplay
Suite of educational games for young children
Print Preview
Preview before printing
Evolvotron
Interactive image generator
Fracplanet
Interactive fractal planet generator

Fyre
Create computational artwork
GGobi
Multivariate interactive graphics for exploratory data analysis
GIMP Image Editor
Create and edit images or photographs

LXImage
The LXQt image viewer
GNU Paint
A small-scale painting program for GNOME, the GNU Desktop
gThumb
View and organize your images

KGraphEditor
A Graphviz dot graph editor for KDE

KGraphViewer
A Graphviz DOT graph viewer
KolourPaint
An easy-to-use paint program
LibreOffice Draw
Create and edit drawings, flow charts, and logos by using Draw.

Mirage
A fast GTK+ Image Viewer
MyPaint
Painting program for digital artists

Pencil2D
Create traditional hand-drawn animation using both bitmap and vector graphics
Pencil
Sketching and GUI prototyping tool
Pinta
Easily create and edit images
PRICE
Precision Raster Image Convolution Engine

Nomacs
nomacs is a free, open source image viewer.
Qreator
Create your own QR codes

RawTherapee
An advanced raw photo development program

rgbPaint painting program
Simple painting program for pixel art
Simple Image Reducer
Reduce and rotate images in three-four clicks.

Sweet Home 3D Furniture Library Editor
Create your own SweetHome3D furniture libraries

Sweet Home 3D Textures Library Editor
Create your own SweetHome3D textures libraries

Sweet Home 3D
Interior design Java application for quickly choosing and placing furniture on a house 2D plan drawn by the end-user with a 3D preview
Synfig Studio
Create and edit 2D animations and compositions
Tiled
Tile Map Editor

Tupi: Open 2D Magic
2D Animation Toolkit

XPaint
Xpaint painting application

XSane Image scanning program
A program to work with scanner. Can be used as a scanning, copier, OCR, fax tools.

XSD Diagram
XML Schema Definition (XSD) diagram viewer

Image Viewer
Browse and rotate images
BB
an ASCII-art demo

Tupi: 2D Magic
2D Animation Toolkit
GNU Image Manipulation Program
Create images and edit photographs
Import with gThumb
Import the photos on your camera card
Kaption
Screen capture and editor

Luminance HDR
Luminance is a graphical user interface used to create and tonemap HDR images

mtPaint
Painting program to create pixel art and manipulate digital photos
PlotDrop
Drag and Drop graph plotting

qiv
Quick Image Viewer
Qliss3D
demonstration tool for Lissajous physiques

Screenie
Create fancy screenshots