Quoting: DrMcCoyWell, my "Missing Linux version" category in Steam currently holds these games:

Air Forte
Atom Zombie Smasher
The Binding of Isaac
BIT.TRIP RUNNER
Botanicula
Braid
Crayon Physics Deluxe
Dear Esther
Draw a Stickman: EPIC
Dustforce
Fieldrunners 2
Flotilla
Fractal: Make Blooms Not War
Greed Corp
Hack, Slash, Loot
Incredipede
Jamestomes
KRUNCH
Lone Survivor
Machinarium
McPixel
Metal Slug 3
NightSky
Offspring Fling!
Paper Sorcerer
Papo & Yo
Shadowgrounds
Shadowgrounds: Surivor
Shelter
Torchlight
Trine
Vessel
Windosill
Wizorb

As well as games that use AGS and could theoretical use the GNU/Linux build of AGS:
Blackwell Convergence
Blackwell Deception
Blackwell Legacy
Blackwell Unbound
Blackwell Epiphany
Primordia

Night Dive studios, who rereleased several old adventure games on Steam, some with ScummVM, some with DOSBox, have also rereleased The 11th Guest and Tex Murphy: Overseer, which both are Windows title (without ScummVM support) and therefore can't use DOSBox. They could maybe use a Wine bottle. Personally, I'd prefer if Night Dive would pay people to RE both The 11th Guest, as well as the whole Tex Murphy series, for ScummVM.

Then there's Cognition: An Erica Reed Thriller, which uses Unity 3 and has had promised Linux support (with no fixed date) since at least September last year. They're looking into upgrading to Unity 4.

Also, there's X2: The Threat, which, AFAIK, had a Linux port done way back when. Both the Mac OS X and the Linux ports were outsourced, though, and from what I've seen, Egosoft never really seemed to care for either of those.

Also, Divinity: Original Sin and Divinity: Dragon Command, which should have Linux support coming soon-ish, after the Divinity: Original Sin launch. And the new Tex Murphy game is also still waiting on Bink, it seems.

Quoting: rustybroomhandleHey all. Just discovered something regarding performance. I'm running Manjaro (Arch-based) with KDE, and with or without compositing the performance is terrible. However, if I switch the window-manager to openbox with "openbox --replace" it improves a lot, even on High settings.

Quoting: Samsai

Quoting: edoCivilization 4 is in my Linux library too. What does that means?

Either someone made a mistake or they've been working really hard with the Civilization series. Aspyr was also behind the Mac port of Civ IV so it's not completely impossible that they would port it to Linux too, especially now that they've already gotten familiar with Linux porting. So far we haven't heard anything so don't be too hopeful.