Rasa

Rasa is a platform for building enterprise chat and voice assistants that combine language models with defined business logic. Product and engineering teams in banking, telecom and insurance use it when they need predictable behavior.

Its CALM approach lets an LLM understand what users say while business processes are written as flows that the assistant follows step by step. This limits hallucinations and makes behavior easier to test.

Rasa can be deployed on a company's own infrastructure, and a no-code studio lets non-developers edit flows and content. It started as a popular open-source framework.