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fern-java
Discontinued Generate Java models, clients, and server interfaces from your API definition.
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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.
If you want to generate a Java client for testing, you can use Fern to generate one: https://github.com/fern-api/fern-java
disclaimer: I'm a maintainer of Fern.
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.