GuideGuide - GuideGuide is the Photoshop and Illustrator panel that makes working with guides.
Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
phpAlbum - phpAlbum.net is an Open Source PHP script which allows creating personal Photo Album / Gallery
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
gcolor2 - GTK+2 Color Selector