Half-Life 2: Update (native on Fedora 20 Linux)
Half-Life 2: Update is a fan-made mod for Half-Life 2 which makes a large number of fairly subtle changes to the original game, mostly improving the lighting, shadows and distance detail of the original. It makes for a more modern experience graphically without changing the gameplay or mood of the original, a criticism that has been levelled against some of the other 'refresh' mods (though I've never played any of them either, so no axe to grind there).
Originally it was released only for Windows but the community has now produces a native Linux version of the mod. This version is free to play if you own the original Half-Life 2.
http://store.steampowered.com/app/290930/
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Half-Life 2 Statistics For Rob Crowther
At this time, Rob Crowther has 119 views for Half-Life 2 spread across 1 video. Less than an hour worth of Half-Life 2 videos were uploaded to his channel, making up less than 0.10% of the total overall content on Rob Crowther's YouTube channel.