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realtime-api

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Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.

  • Updated Aug 25, 2026
  • Python

Vui Nano — a small, context-aware text-to-speech model trained on real conversations. 219M active params (305M total), Apache 2.0, voice cloning, streaming, runs on CPU (dependency-free C build). Ships with a full real-time voice assistant: WebRTC, ASR, local LLM, OpenAI Realtime API compatible.

  • Updated Sep 12, 2026
  • Python

Hermes Talk: realtime duplex voice for Hermes Agent. Rides your ChatGPT or X Premium subscription, no API key needed. OpenAI, Grok, Gemini. Terminal, Discord, dashboard.

  • Updated Sep 17, 2026
  • Python

Open-source Android framework for low-latency, LLM-driven multimodal interaction on Pepper. Uses end-to-end speech-to-speech models and extensive Function Calling for agentic robot control (navigation, gaze, vision, touch). Also runs on regular Android devices.

  • Updated Sep 16, 2026
  • Kotlin

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