GIMP - GIMP is a multiplatform photo manipulation tool.
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
Fiji - Fiji: A batteries-included distribution of ImageJ.
VKS Lite - Go paperless with the VKS work instruction software. Create step-by-step instructions with pictures, videos, PDFs and more! Version control, mass updates...
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Nomuda VisualFactory - VisualFactory MES digitizes work instructions, enhances manufacturing efficiency and improves product traceability.