Using the command line is an option, and would remove the need for an Eclipse Plugin. First, create a directory to hold the project.
mkdir myGitRepo
cd myGitRepo
Clone the desired repository in the directory you just created.
git clone https://github.com/JonasHelming/gitTutorial.git
Then open Eclipse and select the directory you created (myGitRepo) as the Eclipse Workspace.
Don't worry that the Project Explorer is empty, Eclipse can't recognize the source files yet.
Lastly, create a new Java project with the exact same name as the project you pulled. In this case, it was 'gitTutorial'.
File -> New -> Java Project
At this point, the project's sub directories should contain the files pulled from Github. Take a look at the following post in my blog for a more detailed explanation.
http://brianredd.com/application/pull-java-project-from-github