The games or software on this list do not have any DRM once they are installed which means that they do not require the Steam client to be played.
Typically, you don't have to tweak the games or software in order to run them wherever you want; the list will make notes of any exceptions.
Windows version requires both Steam (game will freeze before title screen without it running) and Kalypso account login (can be blocked through Windows Firewall, but Steam will still be required); Linux version requires neither Linux: i386 version of 0 must be included in shared libraries.
Linux: Copy the libs lib SDL2-2.00, lib SDL2_image-2.00 and lib SDL2_mixer-2.00 from ~/.steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu to /usr/lib (You may have to copy the libs with extened suffix and rename them accordingly).
Copy "nmrih" folder into "sdk" folder; Windows: Open command prompt and type "hl2-game nmrih" (without quotes)Linux: Open terminal window and type "./hl2-game nmrih" (without quotes)Only setting max players to 1 will work; disable v-sync to increase framerate Windows: Run "hl2-game portal" in Command Prompt (without quotes); Common install location is C:\Program Files (x86)\Steam\Steam Apps\common\Portal Linux/Mac: Run "./hl2-game portal" in Terminal (without quotes) Run with the following command: "Sanctum Game-Win32-nosteam" GAME WILL NOT SAVE OR LOAD IF RUN OUTSIDE OF STEAM (a past update moved save data from Sanctum to the Steam Cloud folder) The games on this list are games using Flash, Adobe Air or .
NET (for simplicity bundled in this list for Flash games). NET on Steam, including those not on this list, are Launcher-free. Every Paradox Development Studio game is DRM-free and even some they publish (Paradox Interactive).
This is a list of games and software available on Steam that do not use any third party DRM (e.g GFWL, Uplay, Denuvo, etc.) or the Valve CEG ("Custom Executable Generation") component, making them effectively Launcher-free once installed.
This means that you can copy the game folder anywhere you want and launch the program directly without being online or having Steam or a third party software running.
Q: How do you determine if a game or software is launcher-free on Steam?
A: Install the game or software and run it online the first time (this step is important as this finalizes the installation).
Shut down Steam and temporarily move all the files in the root Steam folder somewhere else, and rename/delete to something else temporarily.
Locate game folder, find the program launcher and run it.