Windmill

Windmill is an open source workflow engine and developer platform founded in 2022 in Paris, France. It is designed for engineering teams that need to build, schedule, and orchestrate internal scripts, data pipelines, and approval workflows without reinventing infrastructure. Unlike no-code automation tools that target business users, Windmill is developer-first: it lets teams write scripts in TypeScript, Python, Go, Bash, and SQL, then compose them into flows with a visual editor that handles scheduling, retries, error handling, and approvals.

The platform provides a browser-based script editor with inline previews, a flow builder for chaining scripts into multi-step workflows, and a UI builder for creating internal tools on top of those workflows. Windmill supports webhooks for triggering flows from external events, cron-based scheduling for recurring tasks, and human-in-the-loop approval steps for sensitive operations. Resource management allows teams to securely store and share API credentials, database connection strings, and configuration variables. Every execution is logged with full input/output history, making debugging and auditing straightforward.

As an open source project licensed under AGPLv3, Windmill can be self-hosted on any infrastructure, giving teams full control over their data and execution environment. The company also offers a managed cloud service hosted on EU infrastructure for teams that prefer not to manage their own deployment. For European businesses looking to replace US-based automation platforms like Zapier or IFTTT with something more powerful and code-native, Windmill provides a compelling alternative that combines the flexibility of writing real code with the convenience of visual orchestration, all while keeping data within European jurisdiction.