NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.
XSane - A good proposal for SANE-2 has been written.
Process Street - Create beautiful rich process documents in a simple to follow checklist format. Fast, free and incredibly simple to use.