Old Wikipedia article, before my edit.
https://media.freesoftwareextremist.com/media/c3/81/a6/c381a68abddbb3a2ef5642eee363ed887def7460d49f44c684de5a3e25bc4c29.png
I was looking at the Wikipedia page of Bengali Input methods and android apps. The article claimed a version of Borno app, which supports many Bengali keyboard layouts, is free software. A little more investigation revealed that they develop a Windows version and that one is free software, and not android version.
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