Short answer: Rudder is an open-source Segment alternative written in Go, built for the enterprise. https://rudderlabs.com.
Long answer: Rudder is a platform for collecting, storing and routing customer event data to dozens of tools. Rudder is open-source, can run in your cloud environment (AWS, GCP, Azure or even your data-centre) and provides a powerful transformation framework to process your event data on the fly.
Released under Apache License 2.0
We are building Rudder because we believe open-source and cloud-prem is important for three main reasons
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Privacy & Security: You should be able to collect and store your customer data without sending everything to a 3rd party vendor or embedding proprietary SDKs. With Rudder, the event data is always in your control. Besides, Rudder gives you fine-grained control over what data to forward to what analytical tool.
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Processing Flexibility: You should be able to enhance OR transform your event data by combining it with your other internal data, e.g. stored in your transactional systems. Rudder makes that possible because it provides a powerful JS-based event transformation framework. Furthermore, since Rudder runs inside your cloud or on-prem environment, you can access your production data to join with the event data.
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Unlimited Events: Event volume-based pricing of most commercial systems is broken. You should be able to collect as much data as possible without worrying about overrunning event budgets. Rudder's core BE is open-source and free to use.