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FlorisBoard
An open-source keyboard for Android which respects your privacy. Currently in early-beta.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There is a more thorough explanation here, including numbers to evaluate the pruning methodology and how to combine different models including language models: https://github.com/AnySoftKeyboard/AnySoftKeyboard/pull/1870
FlorisBoard is open source and has an implementation for this (en-us only for now): https://github.com/florisboard/florisboard
It's okay, but definitely worse than proprietary alternatives right now. But at least it's under active development.