Does Brink use GFWL or Steamworks?

Solution 1:

See the Brink FAQ being maintained on the Steam forums:

Q. Is BRINK a GFWL title?

Nope. BRINK is a Steamworks title. BRINK carries the 'Games for Windows' moniker, which is different to GFWL. For a game to be certified for GFW, it has to meet the following requirements:

• An "Easy Install" option that installs the title on a PC in the fewest possible steps and mouse clicks
• Compatibility with the Windows Vista/ 7 Games Explorer
• Installs and runs properly on x64 versions of Windows Vista/ 7 and is compatible with 64-bit processors (though the game itself can be 32-bit)
• Supports normal and widescreen resolutions, such as 4:3 aspect ratio (800 x 600, 1024 x 768), 16:9 aspect ratio (1280 x 720, 1920 x 1080), and 16:10 aspect ratio (1280 x 800, 1440 x 900, 1680 x 1050, 1920 x 1200)
• Supports parental controls and family settings features in Windows Vista/ 7
• Supports launching from Windows Media Center

Q. Can I activate a retail copy through Steam?

BRINK uses Steamworks so retail copies can be activated through Steam.

Solution 2:

http://store.steampowered.com/app/22350/

It uses SteamWorks in the Steam version, it has Steam achievements, Steam leaderboards, etc...