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Neighbor

Mint

Both playable out of the box without Steam on Win7/64
Risen

Download and extract the contents of the following file

[url=ftp://ftp.kochmedia.com/pub/hotline/deepsilver/risen/Risen_Patch_1.10_MUI_HP.zip]ftp://ftp.kochmedia.com/pub/hotline/deepsilver/risen/Risen_Patch_1.10_MUI_HP.zip[/url]

provided by the publisher of the game into the corresponding installation folder, overwriting existing files. This should go into the "Patchable Games" category of the wiki if I'm not mistaken.

Tested on Win XP 32-bit, Win 7 64-bit and Win 10 64-bit
Post edited April 22, 2019 by DCG83
The Darkside Detective (currently listed for Linux) is also DRM-Free for Windows without any workarounds.
Post edited April 26, 2019 by AB2012
Gothic II: Gold Edition

Download and install this patch to make the game run without the Steam client.

Tested on Win XP 32-bit, Win 7 64-bit and Win 10 64-bit

Side note: Gothic 1 and Gothic 3 are already in the wiki, but they should be in the "Patchable Games" category as well.
Okay, we're all updated again. I'll take a look at that long list of ScummVM stuff when I get a chance to sit down for a bit longer, but for now, everything other than that is good to go.
Guard Duty can be played without Steam out of the box.

Tested on Win7/64
Divide by Sheep runs fine without the client on Windows 10.
Another bunch of Artifex Mundi games - all work with the steam_appid.txt trick on Win7/64:

Chronicles of Magic: Divided Kingdoms (746840)
Ghost Files: The Face of Guilt (599560)
Grim Legends 3: The Dark City (458470)
Kingmaker: Rise to the Throne (834390)
Lost Grimoires: Stolen Kingdom (536780)
Queen's Quest 4: Sacred Truce (814030)
Blood: Fresh Supply

Playable without the Steam client. Tested on Win 10 64-bit.
Prey (2006)

Although this game was removed from the Steam store a long time ago, you can still add it to your account with a retail or Steam key. Now if you download and install the retail patch 1.4 from here it overwrites the prey.exe, making the game playable without the Steam client.

Tested on Win 10 64-bit.