The GRASS source code is available on Github, see all source code archives for releases (zip and tarball files). Alternatively, find the latest tarballs and snapshots at https://grass.osgeo.org/grass84/source/.
Download GRASS packages for your favorite Linux distribution
Download GRASS installers for Windows
Download bundled GRASS binaries for your Mac
Download GRASS Docker images
Install GRASS with conda from conda-forge
Download user contributed GRASS extensions
Download ready-to-use GRASS sample datasets