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redis (use streams and pubsub)
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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kafka
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libp2p
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nats
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gRPC (this is more for exposing your services through an API)
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webrtc
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Pytorch
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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opencv
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nalgebra (similar to Eigen in cpp)
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optimization-engine
Nonconvex embedded optimization: code generation for fast real-time optimization + ROS support
optimization engine
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rapier
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parry
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kiss3d
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.