Nek5000 is hosted in two repositories: an up-to-date Git repository and a legacy SVN repository. Both are available for download.
Downloading the Nek5000 Source Code
The Nek5000 source code is maintained at https://github.com/Nek5000/Nek5000. You can download the latest version with the following command:
git clone https://github.com/Nek5000/Nek5000.git
Downloading the Nek5000 Example Problems
The Nek5000 examples are maintained at https://github.com/Nek5000/NekExamples. Theres is only a single branch, which may be downloaded with:
git clone https://github.com/Nek5000/NekExamples.git
You can checkout the legacy SVN repository via:
svn co https://svn.mcs.anl.gov/repos/nek5 nek5_svn
This version was last updated on June 2, 2016.