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.
Intel XDK Intel XDK is an Integrated Development Environment (IDE) created by Intel to create native apps for mobile phones and tablets using web technologies like HTML5, CSS and JavaScript. Apps are created edited and simulated using the IDE then exported to Adobe® PhoneGap or Cordova CLI for compilation into a native code app. The IDE allows a developer to create the same solution to different platforms, thus reducing the amount of code required to ship a cross-platform product. The XDK was first launched in October 2013.