Xabber is available on the Android Play Store and another software repository that contains only apps that are what ?
Xabber Xabber (from XMPP and Jabber) is a XMPP client for the Android Operating System. It is developed as an open source Project on GitHub and is licensed under the GNU/GPL v.3 license. The original developers are from a software company called Redsolution, Inc. Xabber is available on the Android Play Store and on F-Droid.
Fire OS Amazon Fire OS is an Android-based mobile operating system produced by Amazon for its Fire Phone and Kindle Fire range of tablets, Echo and Echo Dot, and other content delivery devices like Fire TV; the tablet versions of the Kindle e-readers are the Fire range. It is forked from Android. Fire OS primarily centers on content consumption, with a customized user interface and heavy ties to content available from Amazon's own storefronts and services.