GNU/Linux Installing Git Client Guide
The linked Tutorials Show You Step-by-Step How to Install some most diffused Git Clients on GNU/Linux Desktops.
CollabNet GitEye is an Intuitive Graphical Git Client with Integration to your favorite Planning, Tracking, Code Reviewing, and Build Tools.
SmartGit is a Graphical Git and Mercurial Client which can also connect to SVN Repositories.
Axosoft GitKraken is an Intuitive Graphical Git Client with Visual Interaction, Drag&Drop Commits changes and Git Hosting Service Integration.
Git-Cola is a Sleek and Powerful Git GUI written in Python and GPL Licensed.