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Sim
Your AI workspace for building agentic workflows.
Sim is an open-source platform for building and deploying AI agent workflows, used by over 100,000 builders with 30,000+ GitHub stars. You build agents on a visual canvas by connecting models, tools, logic, and data, with 100+ integrations and support for every major model provider. Workflows deploy as a REST API, scheduled job, webhook, chat interface, or MCP server. Most workflow tools were built for deterministic automation and had AI added later, while Sim was designed for agents from the start. It's Apache 2.0 licensed, so you can self-host the whole platform, and the free tier is fully functional rather than a limited trial.