The best open-source Workflow Automation tools, curated: 28 in the registry, including Apache Airflow, Flowable, taskt. Every tool is open-source; each entry lists license, self-hostability, and links.
Apache Airflow· tool, 2026-09-28 Apache Airflow is open source (Apache-2.0): a platform to programmatically author, schedule and monitor workflows as directed acyclic graphs (DAGs) written in Python. Pipelines are maintainable, versionable and testable; a rich web UI visualizes runs and troubleshooting, with extensible operators and Jinja templating. An Apache Software Foundation project.
Flowable· tool, 2026-09-28 Flowable is a compact, open-source (Apache-2.0) BPM platform for developers: a fast, tried-and-tested BPMN process engine, CMMN case engine, and DMN rule engine written in Java. Runs embedded in a JVM app or as a server/cluster/cloud service. Apache-2.0 open source with a committed community edition; full documentation at flowable.org.
taskt· tool, 2026-09-26 Free, open-source robotic process automation (RPA) built in C#/.NET for Windows: a visual, no-code bot designer with element and screen recording, dozens of automation commands, desktop and web app automation, and Excel integration. Optionally runs custom .NET, PowerShell, or VBScript for advanced steps. Apache-2.0.
AgentRun· tool, 2026-09-24 AgentRun is a workflow DSL from Parcha-ai — expressed in JSON or TypeScript — for turning repeatable AI-agent work into orchestrated, typed workflows. It ships beta npm packages and is self-hostable under Apache-2.0. It is brand-new: created 2026-09-23, only 20 stars, and explicitly beta, so treat it as an early bet rather than a settled orchestration layer.
AI-rete-RAG· news, 2026-09-22 A hosted decisioning service that splits the two jobs teams usually hand to one LLM: a deterministic Rete rule engine renders the actual verdict, and an LLM writes the plain-English explanation grounded by RAG over your ingested policy documents. It is exposed through an MCP server, with demo domains for lending, fraud, clinical, insurance and legal. The MCP client wrapper is MIT, but the decision engine itself is closed and sits behind a hosted API key.
Dagychu· tool, 2026-09-19 Dagychu is a self-hosted execution control plane for production Python and Bash jobs, with pipelines, scheduling, logs, retries, and recovery controls. Dagychu Community is free to self-host from versioned container images; its public repository contains distribution materials, not the unpublished application source.
jBPM/Apache KIE· tool, 2026-09-15 Apache-2.0 umbrella (Apache Incubator) for integrated business automation: the Drools rule engine (DMN, complex event processing), jBPM workflow engine (BPMN 2.0), OptaPlanner constraint solver and cloud-native Kogito runtime. The oldest open-source BPM lineage — relevant as Camunda 7 reaches EoL and Camunda 8's core went source-available.
Temporal· tool, 2026-09-15 Durable-execution platform (MIT core) for distributed applications: the runtime persists workflow state, handles intermittent failures and retries failed operations automatically, so business logic survives process crashes. Originated as a fork of Uber's Cadence by its creators; ships a Web UI, CLI and multi-language SDKs. Industry standard for the pattern — but heavy to operate self-hosted.
Wexflow· tool, 2026-09-15 MIT-licensed, cross-platform workflow automation engine (C#): automate file operations, system processes, scripting, networking, email and scheduled batch runs with 100+ built-in activities, a web dashboard, Docker support and 6+ database engines. Approval workflows are first-class; a single-maintainer project.
Crew· tool, 2026-09-07 Open-source coordination layer that lets parallel coding-agent sessions (Claude Code, Codex, opencode) share live context, exchange messages and split work without branching.
AppFlowy· tool, 2026-09-03 OSS alt to Notion; ~75102 stars; AGPL copyleft; via ossinsight.io
cua (Computer-Use Agents)· tool, 2026-09-03 OSS alt to proprietary computer-use sandboxes; ~21100 stars; complements macOS-use (XREF), self-operating-computer, Open Interpreter; MIT. NOT the same as XREF macOS-use: this is the broader trycua/cua project (Computer/Lume/Lumier + cross-OS agent fleets & benchmarks) with sandboxed VMs. Sandboxing is the intended safety boundary for computer-use. No per-platform ToS flag.
Lowcoder· tool, 2026-09-03 Retool-clone successor; NocoDB reclassified SA
Open Interpreter· tool, 2026-09-03 OSS alt to ChatGPT Code Interpreter (local); ~67900 stars; complements cua, self-operating-computer, PyAutoGUI; Apache-2.0. LLM writes+runs code locally to operate the machine (incl. computer-use / OS control). Executes arbitrary code -> sandbox or require confirmation; not a per-platform ToS risk but a local-security risk.
OpenRPA· tool, 2026-09-03 Most complete OSI RPA; Windows-only; opt-out telemetry
Robot Framework· tool, 2026-09-03 OSS alt to UiPath Studio, Blue Prism; ~11800 stars; complements rpaframework (Robocorp), TagUI, Selenium/Playwright; Apache-2.0. Mature de-facto OSS RPA/test framework; deterministic keyword-driven (not LLM). No auth model of its own; inherits credentials of the libraries it drives. No per-platform ToS flag.
rpaframework (Robocorp)· tool, 2026-09-03 OSS alt to UiPath, Automation Anywhere activity packs; ~1500 stars; complements Robot Framework, TagUI; Apache-2.0. Battery of RPA libraries (Browser, Excel, PDF, Email, Windows, cloud) for Robot Framework + plain Python. Deterministic. Credentials handled by each library; no per-platform ToS flag.
Skyvern· tool, 2026-09-03 OSS alt to UiPath, Automation Anywhere (AI RPA); ~22700 stars; complements browser-use (XREF), LaVague, Stagehand, Notte; Drives a real browser via LLM+CV; AGPL copyleft (self-host obligations). No reverse-eng of any single platform, so no per-platform ToS flag, but automating logged-in sessions can still trip site anti-bot; use provided credentials/OAuth. Cloud offering is separate.
Stagehand· tool, 2026-09-03 OSS alt to proprietary AI browser-automation SaaS; ~23800 stars; complements Playwright, browser-use (XREF), Skyvern, Notte; MIT permissive. Layers deterministic Playwright with LLM act/extract, so it degrades to code-defined selectors (more reliable than pure-LLM). Generic driver; automating logged-in sites still subject to that site's anti-bot rules.
workflow-use· tool, 2026-09-03 'RPA 2.0' — record + replay deterministic browser workflows on top of browser-use; ~4k stars; AGPL network-copyleft (SaaS caution)
UI-TARS Desktop / Agent TARS· tool, 2026-09-02 An open multimodal GUI-automation agent stack that controls a computer via a vision-language model — clicking, typing, and reading the screen locally — with a CLI and Web UI, browser control, and MCP-tool integration. From ByteDance.
daily-briefing· tool, 2026-08-29 Open-source AI news-briefing agent that runs entirely on GitHub Actions with no server: Groq for the model + Tavily for web search + email delivery. A reference pattern for owned, near-zero-cost GTM automation.
Activepieces· tool, 2026-08-25 Open-source workflow automation (Zapier alternative): no-code builder, 280+ integrations, a TypeScript pieces framework, and ~400 MCP servers for LLM integration. Self-hostable.