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
Download user contributed GRASS extensions
Download ready-to-use GRASS sample datasets