GOG.com has recently launched a promotion which includes discounts up to 90% for over 700 games, from which over 100 are available on Linux too.
Most of the Linux titles benefit from a 50% discount, with the promotion ending on November 25. Some of the games which benefit from discounts are The Witcher 2, Escape Goat 1 & 2, Last Federation, Pinball World & Pinball Gold, Kingdom Rush, FTL, FlatOut 2, Mount & Blade: Warband, Shadowrun Returns.
During this period, so-called “flash deals” are also available, with new discounts every 40 minutes which last a few hours, and daily deals, with new game bundles available every 24 hours.
Kingdom Rush (2014) is a popular single-player tower defense strategy game, available for €3.99, with a 50% discount:
Witcher 2: Assassins of Kings (2012) is the second game in the Witcher role-playing series with beautiful graphics, available for €7.99, with a 50% discount:
Mount & Blade: Warband (2010), a single-player and multi-player 3D role-playing game is available for €7.99:
Shadowrun Returns (2013) is available for €5.99, with a 50% discount:
The full list of games can be found here. The promotion ends on November 25.