ManualsLib - Just enter the keywords in the search field and find what you are looking for!
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
ManualAgent - Manuals and guides
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...
Manuzoid - Repository that includes user manuals for various products
Nomuda VisualFactory - VisualFactory MES digitizes work instructions, enhances manufacturing efficiency and improves product traceability.