n8n

n8n is the automation tool that Zapier built its billion-dollar business on — except n8n gives you the same visual workflow builder for free when you self-host it. The difference isn't just the price: n8n's self-hosted version has no task limits, no per-execution fees, and no premium features locked behind a paywall. The AI workflow nodes are genuinely useful — you can build automations that fetch RSS feeds, summarize them with a local LLM, and post to Slack, all without touching code. The fair-code license means you can use it freely for internal business use. What holds it back slightly from a perfect score is that some enterprise features like SSO are still cloud-only. But for 95% of automation needs, the self-hosted version is more than enough.

Good first choice if you want a practical tool without spending the afternoon reading developer docs.