Hey guys,
First off, you might want to add links to GOG.com for both
Warcraft and
Warcraft II since these are now available from this store:
https://www.gog.com/game/warcraft_bundle
https://www.gog.com/game/warcraft_orcs_and_humans
https://www.gog.com/game/warcraft_2_battlenet_edition
Secondly, I took an interest in the user-made levels for
Warcraft which were created with BJ Pollard's editor mentioned by
Temporary. Preciously few traces of these are available nowadays but luckily the Internet Archive has preserved a page with intact downloads of some 38 levels:
Melle's Warcraft page
A few more levels not included above are available
here, and four more were made by
Kenny Chong. Several more levels not found above are listed
here but sadly downloads are broken.