Install EGIT for Eclipse

Open Eclipse > Help > Install New Software

Enter http://download.eclipse.org/egit/updates for URL

Select all items to install

Wait until finish...

To download a project from GitHub

Open Eclipse > Window > Show View > Git Repositories

Right click > Paste Repository Path or URI

Enter github project url

e.g. https://github.com/tamhonwa/sakatsuku.git

Next > Enter a path for GitHub to download the source code, the folder must be empty.

Right click the repository > Import Projects... > Select the project you want to download