Windmill

Deploy Windmill on Out Plane — an open-source developer platform for building internal tools, workflows, and data pipelines. Windmill combines a script editor, flow builder, and app builder into a single platform. Write scripts in Python, TypeScript, Go, Bash, or SQL with auto-generated UIs and approval flows.

Windmill is an alternative to Retool and Temporal that treats scripts as first-class citizens. Every script gets a webhook endpoint, scheduling capabilities, and version control built-in. The flow builder chains scripts into multi-step workflows with branching, loops, and error handling. Self-hosting on Out Plane gives you unlimited executions with full audit trails.

Perfect for engineering teams that need internal tooling, ETL pipelines, scheduled jobs, and approval workflows with code-first flexibility instead of no-code limitations.