Blizzard is working on a remastered version of their sci-fi RTS progenitor, Starcraft and the expansion beloved for competitive multiplayer, Brood War, but first they’ve gone and made the original versions of the games free as their patch notes for version 1.18 of the almost 20 year old game spell out. Those patch notes also contain links to download the game for Windows and macOS.
The remastered versions of Starcraft and Brood War are planned to be released this summer. When they are, they’ll support widescreen modern resolutions, cloud saves for the campaign, and other modern goodies from Blizzard’s gaming network that was once called Battle.net but is now just called Blizzard. The Starcraft website has more information on what’s coming in that remaster and screenshots of what it’ll look like.