Ask HN: Best no-code workflow builders for LLMs

I’m the CTO at a small startup that builds product operations software.

One of my cofounders is not deeply technical but is a fantastic prompt engineer. He’s been immensely helpful with building large language model prompts that deliver real business value to our customers.

A bottleneck we’re facing is that the complexity of workflows that he can prototype is very limited with the tools we have, mostly constituted out of the LLM playgrounds from commercial providers like OpenAI and Anthropic. I think he would be greatly leveraged by being able to create a DAG of large language model executions that he can compose to build more complex workflows.

Does anyone know of such tools, preferably open-source and locally executable?