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.
Google Spaces (service) Spaces was a proprietary cross-platform application for group discussions and messaging developed by Google. The app was intended to compete with Slack as a content sharing platform where users can create a "space", invite their friends for discussion, and share videos, images, text, and other media. Google services such as the web browser Chrome, search engine Google Search, and video sharing platform YouTube were built into the app to allow users to source content from them. Launched on May 16, 2016, it was available to download on Windows, Mac, Android, and iOS operating systems.