Open-source Amazon EventBridge alternatives

Kestra is an orchestration platform, open source, for data pipelines, AI workflows and infrastructure automation. It brings scheduled and event-triggered automation together under one declarative interface that does not depend on a programming language, applying infrastructure-as-code practices to pipelines so that reliable workflows can be defined in a few lines of YAML.

Workflows can be built in the UI, written by a built-in AI Copilot, or generated from coding agents such as Claude Code and Cursor using agent skills, and everything can be kept as code with Git integration even when it was authored visually. A large plugin ecosystem connects it to external systems, and key concepts cover tasks, triggers and flows. The project is written in Java, with topics covering orchestration, high availability, pipeline-as-code and DevOps, and the 2.0 release adds new capabilities.

Kestra is Apache-2.0 licensed and can be self-hosted, with a quick start that gets a first workflow running in minutes. It targets data engineers, platform teams and automation developers who want an alternative to schedulers such as Airflow with a more declarative style.

Inngest is a workflow orchestration platform built around durable functions. These functions replace separate queues, state management and scheduling so developers can write reliable step functions and background jobs without managing the underlying infrastructure.

An Inngest function has three parts. Triggers are events, cron schedules or webhook events, flow control configures how runs are queued and executed through concurrency, throttling, debouncing, rate limiting and prioritization, and steps are the building blocks that can retry on error and run for months. You write functions with a language SDK, test them with the Inngest Dev Server, deploy them to your own infrastructure and sync them with the Inngest Platform or a self-hosted server, which then calls them securely over HTTPS when events arrive.

Inngest is written in Go. Its quick starts cover Next.js, Node.js and Python, and the documentation includes project architecture and self-hosting guides. The repository lists its licence as other, so check the terms before running it yourself.