Strata Hammer for Linux
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This will work for both 
Momentum Mod and 
Portal 2: Community Edition. 
Portal: Revolution Wasn't tested, but should work.
More in-depth documentation can be found it the Strata Source Wiki.
Installation
Wine or Proton will be needed.
Recommended way by the developers of Strata Source to run Strata Hammer is via Wine. Proton is not recommended for ease of use reasons, and due to some issues with dynamic mounting.
Note:Running Hammer from P2:CE via Proton will throw an error because of dynamic mounting, the error reads Required search path for AppID 620 could not be located. Ensure you have this app installed, or contact a developer.. Momentum Mod's Hammer (and Portal Revolution) does not get this error. If you plan to use Wine, You must install DXVK. Easiest way to do this is via winetricks by opening up a Terminal window and typing winetricks dxvk.
Important:For Momentum Mod, you need to set the compatibility to any Proton version to have the bin/win64 folder, Portal 2: Community Edition already has that folder.Running
Using the Terminal, you can run it by opening in your terminal the location where hammer.exe is. Then run the command wine hammer.exe -winecompat.
Running with Proton
Albeit this is not recommended as per the official Strata documentation, it is possible to run Strata Hammer via Proton
Open the Steam client, Click Add a Non-Steam Game, Navigate to your game folder in steamapps/common then once in the game folder, navigate to bin/ then win64/ and click on hammer.exe to make a Non-Steam shortcut.
After you've added hammer.exe as a Non-Steam shortcut, go to your Steam Library then right click on the newly created hammer.exe then click on Properties.
In Shortcut tab make sure to add -winecompat to launch options. After you've done that go to Compatibility tab, click on the checkbox with the text "Force the use of a specific Steam Play compatibility tool" then select a Proton version.
PROTON_USE_WINED3D=1 %COMMAND% -winecompat for launch options
