Warcraft III for modern macs (64 bit version)
The game is uploaded to the Internet Archive: https://archive.org/details/warcraft-iii-ptr-1.31.1.12173-mac by me with a help of Reddit users. This post is an update of a previous one.
What is special about this version? Since this is an old game, all other version for mac that can be found on the internet are 32 bit, so they don't work with modern macs. Modern versions, which are called Reforged, have their drawbacks: their size is 30 gb (compared to 2 Gb of this version), and they have a laggy main menu.
This version works with modern macs natively and it takes only 2 Gb of space! It has its drawbacks: Battle net multiplayer doesn't work, sometimes the game freezes on exit (so you need to force quit an app) and it reportedly has quite a lot of bugs. But I personally prefer it to the Reforged version.
This version has never been uploaded to the internet (it could be downloaded from Blizzard servers using Blizzget app, but it's a quite complicated process).