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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.
Consider Florisboard has many features and kana Japanese keyboard but you can't write kanji just hiragana and katakana maybe in future releases they include this feature (auto completion)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.