Xabber is available on the Android Play Store and another software repository that contains only apps that are what ?
F-Droid F-Droid is a software repository (or "app store") for Android applications, similar to the Google Play store. The main repository, hosted by the project, contains only apps that are free and open-source software. Applications can be browsed and installed from the F-Droid website or client app without the need to register for an account. "Anti-features" such as advertising, user tracking, or dependence on non-free software are flagged in app descriptions. The website also offers the source code of applications it hosts, as well as the software running the F-Droid server, allowing anyone to set up their own app repository.
Alien Blue Alien Blue, stylized as AlienBlue, was an iOS application for browsing Reddit. It was the official and the most popular Reddit client on the App Store. The app features a wealth of options that tailor the browsing experience to the user. As of May 2016, Alien Blue is no longer available within the App Store on iOS, and has been replaced with Reddit's own application called Reddit: The Official App which is free to download from the Google Play Store and the App Store.