RKrogh 

Interface-based TTS abstraction for .NET. Provides ITtsEngine, SSML detection/preprocessing, and audio utilities with zero dependencies.

Windows SAPI (System.Speech) engine for TextToVoice. Native SSML support with automatic namespace normalization.

SherpaOnnx engine for TextToVoice. Embedded ONNX inference for cross-platform offline synthesis with no external processes.

ElevenLabs engine for TextToVoice. High-quality cloud-based TTS via the ElevenLabs REST API.

Piper TTS engine for TextToVoice. Cross-platform offline synthesis via the Piper executable.

Core abstractions for speech-to-text with pluggable providers

Voxtral (Mistral AI) engine for TextToVoice. Cloud-based TTS with streaming and voice cloning via the Mistral API.

Vosk speech-to-text provider for VoiceToText

NAudio-based microphone capture for VoiceToText (Windows)

Whisper.net speech-to-text provider for VoiceToText