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hskhsk.com
Chinese language vocabulary graph generation. Python/Flask tool that performs dictionary search and analysis on Chinese Hanzi characters. Lists to help with studying for the HSK exam. Beta version of a JavaScript tool for learning to write Hanzi.
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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.
HSK3 is indeed only A1-ish. You can judge for yourself if HSK4 is worth it by looking at the HSK4 vocabulary.
NOTE:
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Hence, a higher number means a more popular project.