There are no immediate plans to bring WriteMapper to Linux. We are however considering adding an Android version to the lineup, if there is enough demand shown for it.
None of this is set in stone, however, and we will continue to examine our plans moving forward by looking at our users wants and needs. Should there be sufficient demand for support on any additional platforms, we'll be happy to move forward in adding it to our product lineup.
As of now, WriteMapper is only available on macOS and Windows as a desktop app, and on iPadOS and iOS as an iPad and iPhone app respectively.
Download links for each version of WriteMapper may be found here.