"G'MIC is a full-featured open-source framework for image processing, distributed under the CeCILL license. It provides several different user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1d scalar signals to 3d+t sequences of multi-spectral volumetric images, thus including 2d color images."

"Easily Convert Bitmap Images To Clean Vector ArtQuickly get your artwork ready to print, embroider, cut, and more with the world's best auto-tracer!"

"Dia is a program to draw structured diagrams."

"Lets you resize images by right-clicking."

to extract images from all kind of video filesavi, mpeg, wmv, mts and many others

Synfig Studio is a free and opensource animation software available for Windows, Linux and OSX.

"Because Mathematics can be so fun!K3DSurf is a program to visualize and manipulate Mathematical models in three, four, five and six dimensions. K3DSurf supports Parametric equations and Isosurfaces."

"JavE is a free Ascii Editor. Rather than for editing texts, it is intended for drawing simple diagrams by using Ascii characters.It is like a graphics editor for editing texts instead of images."

"These Web pages presents a set of examples using ImageMagick ("IM," for short) from the command line. However, they also illustrate what can be done using the ImageMagick Application Programming Interface (API). As such, these pages should be the first stop for IM users after reading the terse Command Line (CLI) Option manuals."

My usually used color picker software.

"Phantasmagoria is a fun, light-weight image editing application. The main focus is to apply effects to images, along with the basic editing that might be required after a sub-par shoot. In other words, what most of us actually need.

"The IconsExtract utility scans the files and folders on your computer, and extract the icons and cursors stored in EXE, DLL, OCX, CPL, and in other file types. You can save the extracted icons to ICO files (or CUR files for cursors), or copy the image of a single icon into the clipboard."

An image browser, converter and editor that supports all major graphic formats including BMP, JPEG, JPEG 2000, GIF, PNG, PCX, TIFF, WMF, ICO, TGA and camera raw files. It has a nice array of features such as image viewing, management, comparison, red-eye removal, emailing, resizing, cropping, color adjustments, musical slideshow and much more.

"This Screen Ruler is a great tool that allows you to accurately measure anything on your screen. This is especially useful when measuring graphics, web page browser sizes or whatever. Screen Ruler can display Pixels, Inches, Picas or Centimeters. "

"TimeSnapper runs in the background of your computer, taking screenshots of your desktop every few seconds all week long."

Search for image dupes and ask to delete it or not.

"JDarkRoom is a popular, simple full-screen text file editor with none of the usual bells and whistles that might distract you from the job in hand. If you are writing a speech, novel, essay, thesis or just need to be able to concentrate on your writing, then JDarkRoom may help you. "

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IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x, ME, NT, 2000, XP, 2003 , 2008, Vista, Windows 7, Windows 8, Windows 10.