Question: I need a workflow automation tool that allows me to write custom code and integrate with external libraries.

n8n is a mature automation tool that's notable for its extensibility and security. It lets you inject code written in JavaScript or Python, and it's got a visual workflow editor. With more than 400 integrations and self-hosted infrastructure, n8n is good for everything from onboarding to security incident response to sales team data enrichment. It's got a range of pricing tiers for different businesses and business sizes.

Another top contender is Pipedream, which lets developers build sophisticated apps with low-level code control and no-code interfaces. It lets you deploy your own code in Node.js, Python, Go and Bash, and it's got access to more than 2,100 APIs through npm and PyPI packages. Pipedream is good for integrating with services like OpenAI, Salesforce and Microsoft Teams, and it's got flexible pricing.

If you want a developer-friendly interface, PROCESIO offers a hybrid of low-code and no-code tools alongside full automation control. It lets you add custom actions with JavaScript, Python and C#, so it's good for both technical and nontechnical people. PROCESIO has a range of features, including a Forms & Tasks Designer, customizable actions and support for lots of APIs, and it charges based on processing time.