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Athena
Discontinued A free and open source replacement for Google Assistant on Android devices, meant to integrate with the Sapphire Framework. It contains both speech-to-text and text-to-speech services. It does not require Google services or network connectivity [Moved to: https://github.com/Tadashi-Hikari/Sapphire] (by Tadashi-Hikari)
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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.
This setup can be used to create a 'push button' assistant (which is in fact what I am in the process of setting it up for) where you quickly record your command, and once finished it runs through the whole processing pipeline. I will be releasing more python/java scripts to do just this, and eventually turning it into a native Android app once I've formalized some of the design. I figured it was something people in this sub might be interested in. You can get the APK, the sample launching script, and the setup instructions on my Github. If you're interested in following the project you can do so at r/SapphireFramework