Qt

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Qt is a cross-platform application and UI framework - some tools from Valve utilize Qt.

Valve ships a modified version of Qt, primarily to allow interoperation with the rest of Source 2:

Valve-Modified Qt 5.15.2: Win64 (Source 2 Workshop Tools since March 2021, Dark Mode is available on this version.)
- Win64 - May 2023 Update (compatible with previous 5.15.2 binaries)
Valve-Modified Qt 4.8.3: Win32 Win64 (Source 2 Workshop Tools released before 2021)

To confirm the version of Qt being used, you can select "About Qt" from the Help menu in the Asset Browser or other tool windows.

List of Source games and software/tools that use Qt: