Rasa

What it does

Rasa is an open-source framework for building conversational AI, centered on CALM (Conversational AI with Language Models), which uses LLMs to drive dialogue while keeping developer-defined business logic in control. Rasa Pro is the commercial license for teams needing production support and higher volume, with Growth-tier contracts starting around $35,000/year.

Who this helps

Your developers want an open-source conversational AI framework.

You want LLM-driven dialogue with your business logic in control.

You need to self-host for compliance.

You build assistants for a large team or enterprise.