Thief is described as 'Series of stealth video games in which the player takes the role of Garrett, a master thief in a fantasy/steampunk world resembling a cross between the Late Middle Ages and the Victorian era, with more advanced technologies interspersed' and is a first-person shooter in the games category. There are more than 25 games similar to Thief for a variety of platforms, including Windows, Steam, Playstation, Xbox and Linux apps. The best Thief alternative is The Elder Scrolls. It's not free, so if you're looking for a free alternative, you could try OpenMW or The Dark Mod. Other Thief like games are Cyberpunk 2077, Metro, Deus Ex and The Suicide of Rachel Foster.
The Elder Scrolls is a series of action role-playing open world fantasy video games primarily developed by Bethesda Game Studios and published by Bethesda Softworks.
It's not a 1st person sneaker
OpenMW is an free and open-source game engine recreation that reimplements the one powering Bethesda Softworks' 2002 open-world role-playing game The Elder Scrolls III: Morrowind.
Cyberpunk 2077 is an ambitious RPG for mature audiences.The game is being developed by CD Projekt RED, developers of the video game The Witcher, in association with the Cyberpunk Pen & Paper system author, Mike Pondsmith.
Metro is a survival horror first-person shooter video game series, based on the novel Metro 2033 by Russian author Dmitry Glukhovsky.
The Dark Mod is a FREE, first-person stealth game inspired by the original Thief series by Looking Glass Studios. In it you play a hooded figure slinking through the shadows of a gothic steampunk city, hunting priceless valuables while avoiding the swords and arrows of those...
It's a fan made tribute to the Thief series with better graphics and gameplay. Includes a level editor and actually has more than 70 missions.
1st person sneaker - however, AI is overly sensitive.
Almost everyone thinks The Dark Mod is a great Thief alternative.
Deus Ex is a series of role-playing video games, set during the mid 21st century. Focusing on the conflict between secretive factions who wish to control the world by proxy, and the effects of transhumanistic attitudes and technologies in a dystopian near-future setting, the...
The Suicide of Rachel Foster is an adventure video game developed by One-O-One Games and published by Daedalic Entertainment.
From the makers of Far Cry, Crysis offers FPS fans the best-looking, most highly-evolving gameplay, requiring the player to use adaptive tactics to survive.
Warframe situates players as members of the Tenno race, newly awoken after years of cryo-sleep into a solar system at war. Reborn into a corrupt era, the Tenno are sought by the oppressive Grineer Empire for annihilation.
Far Cry is a franchise of first-person shooter video games, all of which have been published by Ubisoft. The first game, Far Cry, was developed by Crytek to premiere their CryEngine software, and released in March 2004.
Amnesia: The Dark Descent is a first person survival horror game for Windows, Mac OS X and Linux.
Aliens vs. Predator is a science fiction first-person shooter video game, developed by Rebellion Developments
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not a great analogue but does involve sneaking elements persistent through the game if one so chooses