First Diablo, and now the original Warcraft games have made their way to GOG. I wonder if Warcraft 3: Reforged will end up there at this rate.
Blizzard and GOG announced the partnership this morning, with Warcraft 1 and 2 releasing on the DRM-free marketplace for $8.99 and $13.99 respectively, or in a bundle for $21.99.
Warcraft 2 specifically, like Diablo, comes in two versions: an original mode featuring multiplayer that runs through Blizzard's Battle.net servers, and an updated mode that supports LAN and higher resolution displays (but isn't a full remaster). Warcraft 2 also has the full campaign from Beyond The Dark Portal, so even if you're just enjoying the singleplayer experience, that's still 52 levels to grind through across the Human and Orc campaigns.
It's worth noting that, of the two games, Warcraft 2 probably holds up better. A version was released for Windows, whereas Warcraft 1 runs through DOSBox. (It does run just fine on the latest Windows 10 build, mind you.) And both games are still worth playing through for a grounding in Warcraft, particularly ahead of the Warcraft 3 remastered that's due out later this year.
More details on the original Warcraft can be found here, and here's the listing for Warcraft 2. It's worth noting that neither version is playable on Mac at this stage, even though the original games - and most of Blizzard's catalogue - always released with simultaneous Mac support. Sorry Apple fans.