Pipecat

NVIDIA NeMo Guardrails is an open-source toolkit for adding programmable guardrails to LLM-based conversational systems, supporting topic control, safety enforcement, and dialog guidance.

Botpress is an open-source conversational AI platform with a visual flow editor, knowledge base integration, multi-channel deployment, and GPT/LLM agent building capabilities for enterprise chatbot development.

FastRTC is a developer tool for real-time multimodal and voice applications, useful as a communication layer for low-latency agent conversations and interactive audio/video workflows.

LLM Agent framework within ComfyUI integrating MCP server, TTS, OCR, GraphRAG, and other AI tool nodes for visual workflow building