Valve announces an expansion to the beta "Invite Anyone" program, allowing
Steam users to invite as many friends to join a multiplayer game as the game
will support. The twist is your friends not only don't need to own the game
you're playing, they don't even have to have
Steam installed or a Steam
account, they'll just need the
Steam Link
app. And this covers more friends than before, as they also announce that Steam
Link is now available for Linux. Inviting your friends requires opting into the
Steam Client Beta, and you can find a list of thousands of games that
support Remote Play Together
on this page.