Well, have a look at this topic:
https://www.mobileread.com/forums/sho...d.php?t=274271
The basic conclusions are the following:
If you wanna try these apps you should get a Kindle Keyboard (as most of the active content apps are compatible with that). Kindle 4 or 5 are also OK for this purpose, but there are some apps like Inheritance which are sticked to a physical keyboard.
Some of these apps are created for the touch versions but honestly I can't tell any example when the touchscreen can come in handy by these apps.
When you buy any Kindle other than Kindle Keyboard, then bear in mind that you can come across incompatibility issues. There are approx. 400 apps available in Kindle Store and about the 20% of them are not available for any US accounts either! From the remainder just only a few are not compatible with Keyboard. But much more are not compatible with Paperwhite or Kindle 4 or 5!
Secondly, use a US account. You don't have to be in the USA, just create a US account, so that you can list these apps and hopefully buy them.
Also set the country in the store settings to USA. This determines what you'll see in the Kindle Store.