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IXWebSocket
websocket and http client and server library, with TLS support and very few dependencies
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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're looking for a simple websocket lib with minimal dependencies, https://github.com/machinezone/IXWebSocket might be a good choice. It doesn't need Boost or ASIO (most other websocket libs do), TLS and ZLIB are optional.
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.