The Extreme-scale Scientific Software Stack (E4S) Project is supported by the US Department of Energy Exascale Computing Project (ECP). The packages distributed with E4S contain contributions from hundreds of open source community developers. The top-level packages are listed on the E4S Product Information page
Up to date package version and release information is avalable in the E4S project README
E4S packages are available as pre-built Spack binaries in the E4S Build Cache. Binaries for the major operating systems and architectures are added to the build cache as updates become available in Spack.