Minify images seamlessly
Insane(ly slow but wicked good) PNG image optimization
SIMD-accelerated libjpeg-compatible JPEG codec library
A batch image converter and resizer
JBIG2 Encoder
Easy Tools of PDF, Image, File, Network, Data, and Medias
Free Manga Downloader
A Java-Application to manage and edit images!
Lenna: Open Source Image Processing Program
Batch Images Converter
Image Viewer and Graphic Manipulation Tool
Store your data in images
Full features for Dolphin's right click menu on KDE [4.x|5.x]
Multiplatform GUI to losslessly compress JPEG files
comic book archive manager
A Gimp plugin that simulates a HDR image
Image sizer - Resizes your images in second