Blizzard's 1998 RTS StarCraft has received a new patch and is now free for everyone. In addition to the main game, the expansion Brood War is also free. You can grab it on the following link. 

Patch 1.18

General

 

• Added windowed fullscreen or windowed mode; Alt+Enter switches between
• Added UTF-8 support
• Added cursor clamping in-game while windowed; unclamped in menus
• Added Popular Maps to streamline finding games or game types
• Added options to display actions per minute
• Added Observer mode
• Added opponent information when joining a game lobby
• Added autosaving for replays
• Added an option to display game time
• Added UPnP support
• Updated to a new OpenGL backend
• Improved gameplay responsiveness during multiplayer by increasing turn rate to match LAN speeds over Battle.net
• Improved UI layout in Battle.net sections
• Improved behavior of available lobbies within the ‘Join Game’ section
• Improved compatibility with Windows 7, 8.1, and 10
• Improved anticheat capabilities
• Improved installation and patching performance
• Mac Beta now available for 10.11 and up

Bug Fixes

 

• Fixed palette issues to correct rainbow water, 80s Kerrigan face in the loading screen, and other graphic glitches
• Fixed problems with LAN game discovery
• Fixed IME support and other text artifacts in Battle.net menus
• LAN and Legacy Battle.net fixes

Known Issues

 

• The profile section is currently unavailable
• Some chat commands are still being updated to play nice in the updated chat system
• Friends location is being improperly displayed
• Password games will often return bad password trying to join