The projects from this site are written using Eclipse CDT, but the source does not include the project files because they are not portable across operating systems.
If you want to import one of the projects in Eclipse you will have to create a new "Hello World C++ Project" with the name of the project you want to import, then delete the .cpp file that is automatically created, then Import/SVN/Checkout Projects from SVN the desired project.
All projects also expect to have the "src" directory added to Include paths.
These details are provided for information only. No information here is legal advice and should not be used as such.