Open-source workflow automation
Platforms for connecting apps and running multi-step workflows, now with AI agents in most of them. Some are visual builders for anyone, some are code-first for developers, and the licences differ more here than in any other category.
A fair-code workflow automation platform with 1,500+ integrations, 9,000+ templates, AI agents over OpenAI, Anthropic, Google or open models, and code steps in JavaScript and Python, under the Sustainable Use License.
An LLM app development platform with visual AI workflows, RAG pipelines, sandboxed agents, MCP tools and hundreds of models, under Apache-2.0 plus conditions that forbid multi-tenant use and removing the logo without permission.
An MIT visual platform for building and deploying AI agents and workflows that turns every flow into an API or an MCP server, with Python-editable components and multi-agent orchestration.
An MIT system, running since 2013, for building agents that watch the web and act for you, which its README calls a hackable version of IFTTT or Zapier on your own server, with webhooks, scraping and JavaScript steps.
An MIT automation builder its README calls an open-source replacement for Zapier, with hundreds of TypeScript pieces that double as MCP servers, AI agents, human approval steps and a no-code builder.
Questions people ask
What is the best open-source alternative to Zapier?
Activepieces (MIT) for a no-code builder anyone can use, with pieces that double as MCP servers. n8n for the largest integration library, though its Sustainable Use License limits you to internal and non-commercial use. Windmill for code-first automation, Langflow or Dify for AI-first workflows, Huginn for private rule-based agents.
Which of these are really open source?
Activepieces, Langflow, Huginn and Windmill's source build carry OSI licences. n8n's Sustainable Use License limits use to internal business, personal and non-commercial purposes. Dify adds no-multi-tenant and logo conditions to Apache-2.0. This directory labels those two source available and says why on each page.
Which ones have AI agents?
n8n, Activepieces, Dify and Langflow all build AI agents; Dify gives each agent its own sandbox and Langflow deploys flows as MCP servers. Windmill is code-first with AI-assisted development. Huginn has no AI: its agents are rule-based workers, as they have been since 2013.
Can I build a product on top of these?
Under Activepieces (MIT outside its enterprise folders), Langflow (MIT) or Huginn (MIT), yes. n8n's licence and Dify's multi-tenant clause both need an agreement first, and Windmill needs a commercial licence to resell or to run it as a managed service.
Running one of these inside your own environment, with your own data and your own security rules, is the kind of work Reveneau does. Read how a forward deployed engagement works.