images
Images viewer, manager, converter or editor, etc.
An image viewer and organizer free for personal and educational use with basic image editing tools.
Open source image editor.
A free and open source program that lets you capture your screen with various methods via a single mouse click.
Honeyview 
A very fast image viewer supporting various formats.
Image viewer, editor, organiser and converter. It can also play video and audio files, and has some image creation and painting capabilities.
A multi-functional image processing with command line support.
Free vector-based graphic design software.
available on both GitHub or Sourceforge
Cycle your album like the way in iMac: instant, portable, full-screen slideshow application with the Ken Burns effect.
Free drawing software with a bunch of cool features.
Free image and photo editing.
A full-featured screen capture tool, Intuitive image editor, color picker, color palette, pixel-ruler, protractor, crosshair, whiteboard, etc.
qrcode 
Artistic QR Code in Python (Animated GIF qr code).
Compress images either by file size or by many other image attributes.
ShareX 
A free and open source program that lets you capture or record any area of your screen and share it with a single press of a key.
Splashify
Beautiful desktop wallpapers.
Picturing enlarging noise reduction by AI - CNN(Deep Convolutional Neural Networks) algorithm
XnConvert 
Powerful and free cross-platform batch image converter with simple adjustment ability
An efficient multimedia viewer, organizer and converter with the most formats support.