What are some alternatives?
When comparing GitHub Desktop and SmartGit, you can also consider the following products
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
SourceTree - Mac and Windows client for Mercurial and Git.
git-cola - git-cola is a powerful GUI for git, a distributed revision control system.
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
tig - TIG Software Updates & Expansions. Download the most up-to-date, innovative software solutions for your TIG welder instantly to a memory card for enhanced performance.
TortoiseGit - TortoiseGit is an easy to use client for the Git distributed revision control system.