Please check the package repositories of your distribution.
Right now, we do not provide official binary releases for Linux. This will change for the next official release, with which we will ship AppImages. In the meantime, please use the packages included in your distribution.
Right now, there is no official support for mobile platforms (e.g. Android, iOS). However, there are community-provided ports for some of these platforms. Since we do not own or control these, use of them is at your own discretion. Also, it might be possible that these ports are out of date or have a limited set of features.