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Tink
Discontinued Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
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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.
I find curious that you mentioned tweetnacl because this library don't have one of the issues tweetnacl have: it handles nonces automatically, making it harder to misuse. One of Tink design goals is being harder to misuse and handling nonces for the user is a way to improve that.
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.