Pencil Project : Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in p...
Pro Git : The entire Pro Git book, written by Scott Chacon and published by Apress, is available here
Gitea : Gitea is a community managed fork of Gogs, lightweight code hosting solution written in Go and published under the MIT license.
Git Extensions is the only graphical user interface for Git that allows you control Git without using the commandline. It comes with a manual and video tutorials to get you started quickly.