Originally Posted by BookJunkieLI
So the question is, I know that on any standard Android tablet I can install the Kindle and Nook reader apps, and any other third party reader apps I want. On the Nook or Kindle tablets is it possible to install the Kindle/Nook reader apps on the opposite brand tablet? Or a third party app that would read KF8/Mobi/Epub?
Yes. Not hard at all. Here is a link to epub reader apps directly from Amazon.
For the Nook app just load the 1mobile app to the Fire and download the Nook app. You can also download the nook app from 1mobile to your computer and side load it to the Fire.
On the Fire you will have to allow installation of Applications. Go to more\settings\device and click 'allow installation of applications'.
Very easy. HTH
Edited to add: You do not have to jailbreak the Fire to do this.