Riemann is a 2012-released open-source event stream processor built in Clojure for millisecond-level low-latency processing. It supports high-throughput event aggregation, filtering, transformation, and correlation with TCP/UDP multi-protocol ingestion for real-time monitoring event routing.
Keen (formerly Keen IO) is an API-first custom analytics platform founded in the US. Developers can send arbitrary event data and build fully custom dashboards with streaming processing, real-time queries, and an embeddable Dataviz SDK, suiting product teams, IoT, and deeply customized analytics.
