There are tarballs that require only a C compiler to build. You can also git clone git://github.com/gracelang/minigrace.git, which knows how to build itself using the tools/tarball-bootstrap -a script to bootstrap from a recent version.
There is a prototype client-side web front end. This is adequate for many student programs, and supports simple graphics. We recommend running it in Firefox or Chrome.
There is a Minigrace mailing list for discussing issues related to the minigrace implementation.