There will now be apps made with Xojo in the Amazon App Store: Windows, Mac, and Android, when Xojo Android comes to be. If you'd like, take a moment to share your Xojo-made apps in this thread. Be sure to include links so that people can check them out.

(post inspired by the one by Paul Lefebvre "Xojo Apps in the Mac App Store" that started the thread in the OS X channel)

Check Writer III:
Print checks and their accompanying letter from your PC or Windows tablet

Check Print'R :
Print checks easily from your PC or Windows tablet

The Mac versions are under review.

Has the Amazon App Store now disappeared for both Windows and macOS apps?

I went in as a developer today and it only lets me add Android and Fire TV/tablet apps. I did an internet search and a few sites talk about it, but their screen shot items are missing when you log in.

Am I missing something?

If memory serves, Amazon discontinued their desktop App Store a while ago, although I can't find a mention of that anywhere.

There's just a generic message here:
https://developer.amazon.com/mac-pc