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FOSS alternative to google lens: offline translator
(f-droid.org)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
If the same translation engine is used in multiple apps, then it would probably make sense to have it at system level like it happens for TTS engines. I wonder of this is possible, somehow