It's hard to overstate the influence of Thief, Looking Glass and Ion Storm's definitive stealth series, and one of the greatest games in PC history. Deus Ex, System Shock 2, Dishonored, and myriad other immersive sim RPGs and hybrid FPS games owe a debt of inspiration to The Dark Project, The Metal Age, and Deadly Shadows, but even in the age of remasters and remakes, Thief is yet to make a comeback - barring of course Square Enix's attempt back in 2014. On the contrary, a totally free, unofficial sequel is still going strong. Whether you've already played it or it's your first time, this is a notice to try the freshly updated Dark Mod.
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