Half-Life I ported, following Linux, on Mac OS X

Ahead of Alizar ...
No, the question is not in the competition, but simply earlier, in the news about porting the game to Linux (published under Windows 14 years ago) and in other places they were interested in accessibility under MacOS. And soon, without fanfare and dust, Half Life was available on MacOS. On the game info page with the last modified date of January 26, support for the MacOS version is found:

name_macos: Half-Life (Beta) oslist: windows,macos,linux 

, and the Internet since January 26, was filled with certificates of efficiency and messages about porting. The official purchase page still speaks only of support for the Windows version, although many indicate that both the Linux and modern Mac versions are available after purchase: 1 , 2 , 3 ...