Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
XSane - A good proposal for SANE-2 has been written.