Fluentd, initiated in 2011 and donated to the CNCF in 2016 (graduated 2019), is an open-source log collector serving as a unified logging layer with 500+ plugins and multi-output routing, a mainstream log collection solution for Kubernetes.
Segment is the pioneer of the customer data platform (CDP) category, founded in 2011 in San Francisco, California, USA, and acquired by Twilio for $3.2 billion in 2020, routing customer events to 400+ destinations through a single API across Connections, Protocols, Engage, and Unify.
PostHog is an open-source product analytics platform founded in 2020 in San Francisco, USA, combining product analytics, session recording, feature flags, and A/B testing in one platform, with free self-hosting and cloud hosting, and 30,000+ GitHub stars.
Apify was founded in 2015 in Prague, Czech Republic, as a leading web scraping and data extraction platform offering cloud headless browsers, 3,000+ pre-built Actors and proxy services.
RudderStack is an open-source customer data platform (CDP) founded in 2019 in San Francisco, California, USA, providing a Segment-compatible data pipeline with warehouse-first architecture and 500+ downstream integrations, available as free self-hosting or cloud.