NeMo Guardrails
NVIDIA's open-source toolkit for adding programmable safety, topic, and dialog rails to LLM applications. Define rules in Colang DSL to prevent off-topic responses, enforce output formats, and guard against prompt injection. Standard in enterprise LLM deployments.
Guardrails AI
Open-source framework for adding input/output validation to LLM applications. Define validators (Pydantic-style) for LLM responses to catch hallucinations, PII leaks, bias, and schema violations. Supports automatic retry and reask on validation failure, with any LLM provider.