Yes, through some legal magic they're the only site to sell the older (best) version of Duke Nukem 3D Atomic Edition. I had never used them before buying that but they gave me 0 issues, everything worked perfectly and it was DRM free, with lots of bonus content too.

https://forums.duke4.net/topic/11218-duke-nukem-and-the-zoom-platform/

https://old.reddit.com/r/dukenukem/comments/v5ap2u/duke_3d_atomic_from_zoom/

Never heard of them. But if you want to play old dos/win3x era games, you might want to give http://retro-exo.com a shot. ExoDOS v6 recently released, and there is a lite version. They attempt to archive all DOS games (or win3x games for exoWin3x) it might also have most games you're looking for.

Holy shit, Math Blaster 9-12. You just threw me back SO far. I just had a vivid image in my mind's eye of the home office I played it in.

Thank you for the throwback.